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"DR Congo's hippos face extinction". BBC (engelsk). 13. september 2005. Hentet 14. november 2005.
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bbc.com (Global: 26^th place; Danish: 37^th place)

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bibelselskabet.dk (Global: low place; Danish: 123^rd place)

Bibelen online: Det gamle Testamente – Jobs Bog – Kapitel 40. Bibelselskabet. Hentet 9. januar 2022.

books.google.com (Global: 3^rd place; Danish: 13^th place)

Stewart Keith Eltringham (1999). The Hippos: Natural History and Conservation (engelsk). T & A D Poyser Natural History. ISBN 9780856611315.
Exploring Mammals (engelsk). Marshall Cavendish Corporation. 2008. s. 616. ISBN 9780761477280.

courierpress.com (Global: low place; Danish: low place)

"Celebrate with Donna". Evansville Courier & Press (engelsk). 12. juli 2007. Arkiveret fra originalen 16. januar 2014. Hentet 15. juli 2007.

discogs.com (Global: 73^rd place; Danish: 57^th place)

[ https://www.discogs.com/release/1979505-Michael-Flanders-And-Donald-Swann-At-The-Drop-Of-A-Hat Michael Flanders And Donald Swann – At The Drop Of A Hat]. Discogs. Hentet 13. januar 2022.

doi.org (Global: 2^nd place; Danish: 9^th place)

Lewison, R.; Pluháček, J. (2017). "Hippopotamus amphibius". IUCN's rødliste over truede arter (engelsk). 2017: e.T10103A18567364. doi:10.2305/IUCN.UK.2017-2.RLTS.T10103A18567364.en. Hentet 19. november 2021.
Okello, J.B.A; Nyakaana, S.; Masembe, C.; Siegismund, H.R.; Arctander, P. (2005). "Mitochondrial DNA variation of the common hippopotamus: evidence for a recent population expansion". Heredity (engelsk). 95 (3): 206-215. doi:10.1038/sj.hdy.6800711. ISSN 0018-067X. PMID 16030528.
Tsagkogeorga, Georgia; McGowen, Michael R.; Davies, Kalina T. J.; Jarman, Simon; Polanowski, Andrea; Bertelsen, Mads F.; Rossiter, Stephen J. (2015). "A phylogenomic analysis of the role and timing of molecular adaptation in the aquatic transition of cetartiodactyl mammals". Royal Society Open Science (engelsk). 2 (9): 150156. Bibcode:2015RSOS....250156T. doi:10.1098/rsos.150156. ISSN 2054-5703. PMC 4593674. PMID 26473040.
Ursing, B.M.; Arnason U. (1998). "Analyses of mitochondrial genomes strongly support a hippopotamus-whale clade". Proceedings of the Royal Society (engelsk). 265 (1412): 2251-5. doi:10.1098/rspb.1998.0567. PMC 1689531. PMID 9881471.
Gatesy, J. (1. maj 1997). "More DNA support for a Cetacea/Hippopotamidae clade: the blood-clotting protein gene gamma-fibrinogen". Molecular Biology and Evolution (engelsk). 14 (5): 537-543. doi:10.1093/oxfordjournals.molbev.a025790. PMID 9159931.
Geisler, J. H.; Theodor, J. M. (2009). "Hippopotamus and whale phylogeny". Nature (engelsk). 458 (7236): E1-4, discussion E5. Bibcode:2009Natur.458....1G. doi:10.1038/nature07776. PMID 19295550.
Boisserie, Jean-Renaud; Lihoreau, Fabrice; Brunet, Michel (2005). "The position of Hippopotamidae within Cetartiodactyla". Proceedings of the National Academy of Sciences (engelsk). 102 (5): 1537-1541. Bibcode:2005PNAS..102.1537B. doi:10.1073/pnas.0409518102. PMC 547867. PMID 15677331.
Boisserie, Jean-Renaud; Lihoreau, Fabrice; Brunet, Michel (2005). "Origins of Hippopotamidae (Mammalia, Cetartiodactyla): towards resolution". Zoologica Scripta (engelsk). 34 (2): 119-143. doi:10.1111/j.1463-6409.2005.00183.x.
Lihoreau, F.; Boisserie, J-R.; Manthi, F. K.; Ducrocq. S. (2015). "Hippos stem from the longest sequence of terrestrial cetartiodactyl evolution in Africa". Nature Communications (engelsk). 6: 6264. Bibcode:2015NatCo...6.6264L. doi:10.1038/ncomms7264. PMID 25710445.
Boisserie, Jean-Renaud (2005). "The phylogeny and taxonomy of Hippopotamidae (Mammalia: Artiodactyla): a review based on morphology and cladistic analysis" (PDF). Zoological Journal of the Linnean Society (engelsk). 143: 1-26. doi:10.1111/j.1096-3642.2004.00138.x.
Stuenes, Solweig (1989). "Taxonomy, habits and relationships of the sub-fossil Madagascan hippopotamuses Hippopotamus lemerlei and H. madagascariensis". Journal of Vertebrate Paleontology (engelsk). 9 (3): 241-268. doi:10.1080/02724634.1989.10011761.
Burney, David A.; Ramilisonina (1998). "The Kilopilopitsofy, Kidoky, and Bokyboky: Accounts of Strange Animals from Belo-sur-mer, Madagascar, and the Megafaunal "Extinction Window"". American Anthropologist (engelsk). 100 (4): 957-966. doi:10.1525/aa.1998.100.4.957. JSTOR 681820.
Simmons, A. (2000). "Faunal extinction in an island society: pygmy hippopotamus hunters of Cyprus". Geoarchaeology (engelsk). 15 (4): 379-381. doi:10.1002/(SICI)1520-6548(200004)15:4<379::AID-GEA7>3.0.CO;2-E.
Stuart, Anthony John (1999). Late Pleistocene Megafaunal Extinctions, in Extinctions in Near Time (engelsk). s. 257-269. doi:10.1007/978-1-4757-5202-1_11. ISBN 978-1-4419-3315-7.
Pienaar, U. de V.; Van Wyk, P.; Fairall, N. (1966). "An experimental cropping scheme of Hippopotami in the Letaba river of the Kruger National Park". Koedoe (engelsk). 9 (1). doi:10.4102/koedoe.v9i1.778.
Marshall, P.J.; Sayer, J.A. (1976). "Population ecology and response to cropping of a hippo population in eastern Zambia". The Journal of Applied Ecology (engelsk). 13 (2): 391-403. doi:10.2307/2401788. JSTOR 2401788.
Saikawa Y, Hashimoto K, Nakata M, Yoshihara M, Nagai K, Ida M, Komiya T (2004). "Pigment chemistry: the red sweat of the hippopotamus". Nature (engelsk). 429 (6990): 363. Bibcode:2004Natur.429..363S. doi:10.1038/429363a. PMID 15164051.
van Kolfschoten, Th. (2000). "The Eemian mammal fauna of central Europe". Netherlands Journal of Geosciences (engelsk). 79 (2/3): 269-281. doi:10.1017/S0016774600021752.
Horwitz, Liora Kolska; Eitan Tchernov (1990). "Cultural and Environmental Implications of Hippopotamus Bone Remains in Archaeological Contexts in the Levant". Bulletin of the American Schools of Oriental Research (engelsk). 280 (280): 67-76. doi:10.2307/1357310. JSTOR 1357310.
Haas, Georg (1953). "On the Occurrence of Hippopotamus in the Iron Age of the Coastal Area of Israel". Bulletin of the American Schools of Oriental Research (engelsk). 132 (132): 30-34. doi:10.2307/1355798. JSTOR 1355798.
Grey, J.; Harper, D.M. (2002). "Using Stable Isotope Analyses To Identify Allochthonous Inputs to Lake Naivasha Mediated Via the Hippopotamus Gut". Isotopes in Environmental Health Studies (engelsk). 38 (4): 245-250. doi:10.1080/10256010208033269. PMID 12725427.
McCarthy, T.S.; Ellery, W. N.; Bloem, A (1998). "Some observations on the geomorphological impact of hippopotamus (Hippopotamus amphibius L.) in the Okavango Delta, Botswana". African Journal of Ecology (engelsk). 36 (1): 44-56. doi:10.1046/j.1365-2028.1998.89-89089.x.
Beckwitt, R.; Shea, J.; Osborne, D.; Krueger, S. & Barklow, W. (2002). "A PCR-based method for sex identification in Hippopotamus amphibius" (PDF). African Zoology (engelsk). 37 (2): 127-130. doi:10.1080/15627020.2002.11657167. Arkiveret fra originalen (PDF) 17. juni 2010.
Lewison, R (1998). "Infanticide in the hippopotamus: evidence for polygynous ungulates". Ethology, Ecology & Evolution (engelsk). 10 (3): 277-286. doi:10.1080/08927014.1998.9522857. Arkiveret fra originalen 6. marts 2011. Hentet 6. januar 2022.
William E. Barklow (2004). "Low-frequency sounds and amphibious communication in Hippopotamus amphibious". The Journal of the Acoustical Society of America (engelsk). 115 (5): 2555. Bibcode:2004ASAJ..115.2555B. doi:10.1121/1.4783854.
Brown, C. Emerson (november 1924). "Rearing Hippopotamuses in Captivity". Journal of Mammalogy (engelsk). 5 (4): 243-246. doi:10.2307/1373731. JSTOR 1373731.
Graham L.H.; Reid K.; Webster T.; Richards M.; Joseph S. (2002). "Endocrine patterns associated with reproduction in the Nile hippopotamus (Hippopotamus amphibius) as assessed by fecal progestagen analysis". General and Comparative Endocrinology (engelsk). 128 (1): 74-81. doi:10.1016/S0016-6480(02)00066-7. PMID 12270790.
Cott, H.B. (2010). "Scientific results of an inquiry into the ecology and economic status of the Nile crocodile (Crocodilus niloticus) in Uganda and Northern Rhodesia". The Transactions of the Zoological Society of London (engelsk). 29 (4): 211-356. doi:10.1111/j.1096-3642.1961.tb00220.x.
McCauley, D. J.; et al. (2015). "Carbon stable isotopes suggest that hippopotamus-vectored nutrients subsidize aquatic consumers in an East African river". Ecosphere (engelsk). 6 (4): 1-11. doi:10.1890/ES14-00514.1.
Dutton, C. L.; Subalusky, A. L.; Hamilton, S. K.; Rosi, E. J.; Post, D. M. (2018). "Organic matter loading by hippopotami causes subsidy overload resulting in downstream hypoxia and fish kills". Nature Communications (engelsk). 9 (1951): 1951. Bibcode:2018NatCo...9.1951D. doi:10.1038/s41467-018-04391-6. PMC 5956076. PMID 29769538.
Clark, JD; Beyene, Y; WoldeGabriel, G; Hart, WK; Renne, PR; Gilbert, H; Defleur, A; Suwa, G; et al. (2003). "Stratigraphic, chronological and behavioural contexts of Pleistocene Homo sapiens from Middle Awash, Ethiopia". Nature (engelsk). 423 (6941): 747-52. Bibcode:2003Natur.423..747C. doi:10.1038/nature01670. PMID 12802333.
Kendall, C. J. (2011). "The spatial and agricultural basis of crop raiding by the Vulnerable common hippopotamus Hippopotamus amphibius around Ruaha National Park, Tanzania". Oryx (engelsk). 45 (1): 28-34. doi:10.1017/S0030605310000359.
Snyder, Kristen Denninger (7. december 2015). "The Common Hippopotamus in the Wild and in Captivity: Conservation for Less Charismatic Species". Journal of International Wildlife Law & Policy (engelsk). 18 (4): 337-354. doi:10.1080/13880292.2015.1096162.

etymonline.com (Global: 669^th place; Danish: 265^th place)

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evansvillecvb.org (Global: low place; Danish: low place)

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fandom.com (Global: 902^nd place; Danish: 503^rd place)

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framingham.edu (Global: low place; Danish: low place)

Beckwitt, R.; Shea, J.; Osborne, D.; Krueger, S. & Barklow, W. (2002). "A PCR-based method for sex identification in Hippopotamus amphibius" (PDF). African Zoology (engelsk). 37 (2): 127-130. doi:10.1080/15627020.2002.11657167. Arkiveret fra originalen (PDF) 17. juni 2010.

fupress.net (Global: low place; Danish: low place)

Lewison, R (1998). "Infanticide in the hippopotamus: evidence for polygynous ungulates". Ethology, Ecology & Evolution (engelsk). 10 (3): 277-286. doi:10.1080/08927014.1998.9522857. Arkiveret fra originalen 6. marts 2011. Hentet 6. januar 2022.

gateway-africa.com (Global: low place; Danish: low place)

Why does the Hippo live in water?. Stories and tales by Chrigi, Ranger of the San Clan. Gateway Africa. Hentet 9. januar 2022.

google.com (Global: 109^th place; Danish: 235^th place)

Willams, E. (2017). Hippopotamus. Reaktion Books. ISBN 9781780237794.

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"How Does a Hippo Make Its Own Sunscreen?". HowStuffWorks (engelsk). 2008-10-22. Hentet 2020-04-07.

innovations-report.com (Global: low place; Danish: low place)

Sanders, Robert (25. januar 2005). "Scientists find missing link between the dolphin, whale and its closest relative, the hippo". Science News Daily (engelsk). Arkiveret fra originalen 26. februar 2015. Hentet 8. januar 2011.

itis.gov (Global: 241^st place; Danish: 1,138^th place)

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iucnredlist.org (Global: 39^th place; Danish: 86^th place)

Lewison, R.; Pluháček, J. (2017). "Hippopotamus amphibius". IUCN's rødliste over truede arter (engelsk). 2017: e.T10103A18567364. doi:10.2305/IUCN.UK.2017-2.RLTS.T10103A18567364.en. Hentet 19. november 2021.

jhu.edu (Global: 560^th place; Danish: 1,216^th place)

levysheetmusic.mse.jhu.edu

St. Mars, L. (n.d.). "The Hippopotamus Polka". Levy Music Collection. Hentet 28. august 2018.

journals.co.za (Global: 7,513^th place; Danish: low place)

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jstor.org (Global: 23^rd place; Danish: 111^th place)

Burney, David A.; Ramilisonina (1998). "The Kilopilopitsofy, Kidoky, and Bokyboky: Accounts of Strange Animals from Belo-sur-mer, Madagascar, and the Megafaunal "Extinction Window"". American Anthropologist (engelsk). 100 (4): 957-966. doi:10.1525/aa.1998.100.4.957. JSTOR 681820.
Marshall, P.J.; Sayer, J.A. (1976). "Population ecology and response to cropping of a hippo population in eastern Zambia". The Journal of Applied Ecology (engelsk). 13 (2): 391-403. doi:10.2307/2401788. JSTOR 2401788.
Horwitz, Liora Kolska; Eitan Tchernov (1990). "Cultural and Environmental Implications of Hippopotamus Bone Remains in Archaeological Contexts in the Levant". Bulletin of the American Schools of Oriental Research (engelsk). 280 (280): 67-76. doi:10.2307/1357310. JSTOR 1357310.
Haas, Georg (1953). "On the Occurrence of Hippopotamus in the Iron Age of the Coastal Area of Israel". Bulletin of the American Schools of Oriental Research (engelsk). 132 (132): 30-34. doi:10.2307/1355798. JSTOR 1355798.
Maust-Mohl, M., Soltis, J., Reiss, D. (2018) Underwater click train production by the hippopotamus (Hippopotamus amphibius) suggests an echo-ranging function. Behaviour 155: 231–251.
Brown, C. Emerson (november 1924). "Rearing Hippopotamuses in Captivity". Journal of Mammalogy (engelsk). 5 (4): 243-246. doi:10.2307/1373731. JSTOR 1373731.

krugerpark.co.za (Global: low place; Danish: low place)

"Hippopotamus". Kruger National Park. Hentet 18. juni 2007.

latimes.com (Global: 32^nd place; Danish: 121^st place)

Kraul, Chris (2006-12-20). "A hippo critical situation". Los Angeles Times (engelsk). Arkiveret fra originalen 8. marts 2015. Hentet 2008-03-27.

mountainecology.org (Global: low place; Danish: low place)

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nationalgeographic.com (Global: 489^th place; Danish: 304^th place)

news.nationalgeographic.com

Owen, James (24. oktober 2006). "Hippos Butchered by the Hundreds in Congo Wildlife Park" (engelsk). National Geographic News. Hentet 11. september 2013.
National Geographic exhibit on different animals and their poop. News.nationalgeographic.com (28. oktober 2010). Retrieved on 12. maj 2012.

animals.nationalgeographic.com

"Hippopotamus Hippopotamus amphibius". National Geographic (engelsk). Arkiveret fra originalen 25. november 2014. Hentet 10. juli 2013.

nationalgeographic.com

Wilcox, Christie (31. januar 2020). "Could Pablo Escobar's Escaped Hippos Help the Environment?". National Geographic (engelsk). Hentet 11. februar 2020.

newscientist.com (Global: 1,041^st place; Danish: 542^nd place)

Pearce, Fred (2003). "Poaching causes hippo population crash". New Scientist (engelsk). Hentet 26. april 2014.

nih.gov (Global: 5^th place; Danish: 16^th place)

pubmed.ncbi.nlm.nih.gov

[Boisserie, J.R., Fisher, R.E., Lihoreau, F., Weston, E.M. (2011) Evolving between land and water: key questions on the emergence and history of the Hippopotamidae (Hippopotamoidea, Cetancodonta, Cetartiodactyla). Biological Reviews Cambridge Philosophical Society 86: 601-25. doi: 10.1111/j.1469-185X.2010.00162.x. PMID 20946539.
Okello, J.B.A; Nyakaana, S.; Masembe, C.; Siegismund, H.R.; Arctander, P. (2005). "Mitochondrial DNA variation of the common hippopotamus: evidence for a recent population expansion". Heredity (engelsk). 95 (3): 206-215. doi:10.1038/sj.hdy.6800711. ISSN 0018-067X. PMID 16030528.
Tsagkogeorga, Georgia; McGowen, Michael R.; Davies, Kalina T. J.; Jarman, Simon; Polanowski, Andrea; Bertelsen, Mads F.; Rossiter, Stephen J. (2015). "A phylogenomic analysis of the role and timing of molecular adaptation in the aquatic transition of cetartiodactyl mammals". Royal Society Open Science (engelsk). 2 (9): 150156. Bibcode:2015RSOS....250156T. doi:10.1098/rsos.150156. ISSN 2054-5703. PMC 4593674. PMID 26473040.
Ursing, B.M.; Arnason U. (1998). "Analyses of mitochondrial genomes strongly support a hippopotamus-whale clade". Proceedings of the Royal Society (engelsk). 265 (1412): 2251-5. doi:10.1098/rspb.1998.0567. PMC 1689531. PMID 9881471.
Gatesy, J. (1. maj 1997). "More DNA support for a Cetacea/Hippopotamidae clade: the blood-clotting protein gene gamma-fibrinogen". Molecular Biology and Evolution (engelsk). 14 (5): 537-543. doi:10.1093/oxfordjournals.molbev.a025790. PMID 9159931.
Geisler, J. H.; Theodor, J. M. (2009). "Hippopotamus and whale phylogeny". Nature (engelsk). 458 (7236): E1-4, discussion E5. Bibcode:2009Natur.458....1G. doi:10.1038/nature07776. PMID 19295550.
Boisserie, Jean-Renaud; Lihoreau, Fabrice; Brunet, Michel (2005). "The position of Hippopotamidae within Cetartiodactyla". Proceedings of the National Academy of Sciences (engelsk). 102 (5): 1537-1541. Bibcode:2005PNAS..102.1537B. doi:10.1073/pnas.0409518102. PMC 547867. PMID 15677331.
Lihoreau, F.; Boisserie, J-R.; Manthi, F. K.; Ducrocq. S. (2015). "Hippos stem from the longest sequence of terrestrial cetartiodactyl evolution in Africa". Nature Communications (engelsk). 6: 6264. Bibcode:2015NatCo...6.6264L. doi:10.1038/ncomms7264. PMID 25710445.
Saikawa Y, Hashimoto K, Nakata M, Yoshihara M, Nagai K, Ida M, Komiya T (2004). "Pigment chemistry: the red sweat of the hippopotamus". Nature (engelsk). 429 (6990): 363. Bibcode:2004Natur.429..363S. doi:10.1038/429363a. PMID 15164051.
Grey, J.; Harper, D.M. (2002). "Using Stable Isotope Analyses To Identify Allochthonous Inputs to Lake Naivasha Mediated Via the Hippopotamus Gut". Isotopes in Environmental Health Studies (engelsk). 38 (4): 245-250. doi:10.1080/10256010208033269. PMID 12725427.
Graham L.H.; Reid K.; Webster T.; Richards M.; Joseph S. (2002). "Endocrine patterns associated with reproduction in the Nile hippopotamus (Hippopotamus amphibius) as assessed by fecal progestagen analysis". General and Comparative Endocrinology (engelsk). 128 (1): 74-81. doi:10.1016/S0016-6480(02)00066-7. PMID 12270790.
Dutton, C. L.; Subalusky, A. L.; Hamilton, S. K.; Rosi, E. J.; Post, D. M. (2018). "Organic matter loading by hippopotami causes subsidy overload resulting in downstream hypoxia and fish kills". Nature Communications (engelsk). 9 (1951): 1951. Bibcode:2018NatCo...9.1951D. doi:10.1038/s41467-018-04391-6. PMC 5956076. PMID 29769538.
Clark, JD; Beyene, Y; WoldeGabriel, G; Hart, WK; Renne, PR; Gilbert, H; Defleur, A; Suwa, G; et al. (2003). "Stratigraphic, chronological and behavioural contexts of Pleistocene Homo sapiens from Middle Awash, Ethiopia". Nature (engelsk). 423 (6941): 747-52. Bibcode:2003Natur.423..747C. doi:10.1038/nature01670. PMID 12802333.

ncbi.nlm.nih.gov

Tsagkogeorga, Georgia; McGowen, Michael R.; Davies, Kalina T. J.; Jarman, Simon; Polanowski, Andrea; Bertelsen, Mads F.; Rossiter, Stephen J. (2015). "A phylogenomic analysis of the role and timing of molecular adaptation in the aquatic transition of cetartiodactyl mammals". Royal Society Open Science (engelsk). 2 (9): 150156. Bibcode:2015RSOS....250156T. doi:10.1098/rsos.150156. ISSN 2054-5703. PMC 4593674. PMID 26473040.
Ursing, B.M.; Arnason U. (1998). "Analyses of mitochondrial genomes strongly support a hippopotamus-whale clade". Proceedings of the Royal Society (engelsk). 265 (1412): 2251-5. doi:10.1098/rspb.1998.0567. PMC 1689531. PMID 9881471.
Boisserie, Jean-Renaud; Lihoreau, Fabrice; Brunet, Michel (2005). "The position of Hippopotamidae within Cetartiodactyla". Proceedings of the National Academy of Sciences (engelsk). 102 (5): 1537-1541. Bibcode:2005PNAS..102.1537B. doi:10.1073/pnas.0409518102. PMC 547867. PMID 15677331.
Dutton, C. L.; Subalusky, A. L.; Hamilton, S. K.; Rosi, E. J.; Post, D. M. (2018). "Organic matter loading by hippopotami causes subsidy overload resulting in downstream hypoxia and fish kills". Nature Communications (engelsk). 9 (1951): 1951. Bibcode:2018NatCo...9.1951D. doi:10.1038/s41467-018-04391-6. PMC 5956076. PMID 29769538.

nla.gov.au (Global: 112^th place; Danish: 579^th place)

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nyati-safari.dk (Global: low place; Danish: low place)

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oup.com (Global: 292^nd place; Danish: 504^th place)

academic.oup.com

Boisserie, Jean-Renaud (2005). "The phylogeny and taxonomy of Hippopotamidae (Mammalia: Artiodactyla): a review based on morphology and cladistic analysis" (PDF). Zoological Journal of the Linnean Society (engelsk). 143: 1-26. doi:10.1111/j.1096-3642.2004.00138.x.

pandaclub.dk (Global: low place; Danish: low place)

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pbs.org (Global: 260^th place; Danish: 334^th place)

"Hippopotamuses" (engelsk). PBS Nature. Arkiveret fra originalen 12. oktober 2013. Hentet 10. juli 2013.

petethomasoutdoors.com (Global: low place; Danish: low place)

Thomas, Pete (14. januar 2015). "Massive hippo charges safari boat in Malawi, Africa" (engelsk). Pete Thomas Outdoor. Arkiveret fra originalen 14. september 2025. Hentet 9. januar 2022.

pinetreeweb.com (Global: low place; Danish: low place)

Orans, Lewis P. (17. juni 1997). "Scouting in South Africa 1884–1890" (engelsk). Pinetreeweb.com. Arkiveret fra originalen 28. juli 2014. Hentet 29. marts 2011.

sarkive.com (Global: low place; Danish: low place)

"Hippopotamus" (engelsk). Arkiveret fra originalen 8. august 2020. Hentet 2020-10-22.

sciencehistory.org (Global: 5,038^th place; Danish: 3,177^th place)

Kean, Sam (2018). "Sweating blood". Distillations (engelsk). 4 (2): 5. Hentet 20. august 2018.

scientificamerican.com (Global: 1,110^th place; Danish: 723^rd place)

blogs.scientificamerican.com

Eplett, Layla (27. marts 2014). "The hunger game meat: How hippos early invaded American cuisine". Scientific American (engelsk). ISSN 0036-8733.

scouting.org.za (Global: low place; Danish: low place)

Ingonyama – he is a lion! Arkiveret 21. december 2019 hos Wayback Machine. Scouting.org.za. Retrieved on 29 March 2011.

scribd.com (Global: 467^th place; Danish: 879^th place)

Meijaard, Erik, red. (september 2005). "Suiform Soundings: The IUCN/SSC Pigs, Peccaries, and Hippos Specialist Group (PPHSG) Newsletter" (PDF). IUCN (engelsk). 5 (1).

semana.com (Global: 1,783^rd place; Danish: 2,974^th place)

sostenibilidad.semana.com

"En 10 años Colombia tendrá 150 hipopótamos" (engelsk). Semana Sostenible. 2. december 2019. Hentet 10. februar 2020.

serious-science.org (Global: low place; Danish: low place)

Lihoreau, F. (19. juni 2015). "New Fossils from Kenya Precise Hippo Origin" (engelsk). Serious Science. Hentet 5. juni 2021.

sleepdeprived.ca (Global: low place; Danish: low place)

dragon.sleepdeprived.ca

Hippopotamus Song (Mud, Mud, Glorious Mud). Lyrics. Hentet 13. januar 2022

smithsonianmagazine.com (Global: low place; Danish: low place)

"Hippo Haven". Smithsonian Magazine (engelsk). 1. januar 2006. Hentet 23. januar 2007.

theatlantic.com (Global: 322^nd place; Danish: 591^st place)

Yong, Ed (16. maj 2018). "Hippos Poop So Much That Sometimes All the Fish Die". The Atlantic (engelsk). Hentet 23. juni 2021.{{cite web}}: CS1-vedligeholdelse: url-status (link)

thedailybeast.com (Global: 517^th place; Danish: 885^th place)

Mooallem, Jon (10. august 2014). "Lake Bacon: The Story of The Man Who Wanted Us to Eat Mississippi Hippos". The Daily Beast (engelsk). ISSN 0028-9604. Hentet 13. august 2014.

thepolitic.org (Global: low place; Danish: low place)

Nagvekar, Rahul (8. marts 2017). "Zoo Gone Wild: After Escobar, Colombia Faces His Hippos". The Politic (engelsk). Hentet 25. august 2017.

today.com (Global: 773^rd place; Danish: 1,661^st place)

Fears, Danika (3. august 2012). "Goodbye, Donna: World's oldest hippo in captivity dies at 61" (engelsk). Today.com. Arkiveret fra originalen 4. juni 2013. Hentet 12. september 2013.

toledozoo.org (Global: low place; Danish: low place)

"Bubbles' legacy". www.toledozoo.org (engelsk). Arkiveret fra originalen 3. maj 2015. Hentet 16. december 2015.
"Hippoquarium" (engelsk). Toledo Zoo. Arkiveret fra originalen 11. februar 2007. Hentet 26. marts 2007.

toonopedia.com (Global: 5,448^th place; Danish: low place)

Markstein, Don (2008). "Peter Potamus". Don Markstein's Toonopedia. Arkiveret fra originalen 30. juni 2012.

tufts.edu (Global: 192^nd place; Danish: 251^st place)

perseus.tufts.edu

Herodotus (marts 2003). "Chapter 71, Book II". The Histories. ISBN 978-0-19-521974-6. (Engelsk oversættelse)

uchicago.edu (Global: 226^th place; Danish: 261^st place)

penelope.uchicago.edu

Pliny the Elder (1. januar 1987). "Chapter 15, Book VIII". Naturalis Historia (engelsk). ISBN 978-3-519-01652-6. (English translation; Latin original)

ultimateungulate.com (Global: low place; Danish: 5,602^nd place)

"Hippopotamus amphibius" (engelsk). Hentet 2020-10-22.

umich.edu (Global: 429^th place; Danish: 657^th place)

animaldiversity.ummz.umich.edu

"Physical Description" (engelsk). Hentet 2020-10-22.

wcs.org (Global: low place; Danish: low place)

newsroom.wcs.org

Delaney, J.; Sautner, S. (3. november 2016). "After a Long Demise Due to Poaching, Virunga's Hippos Climbing Back" (engelsk). Wildlife Conservation Society. Hentet 25. november 2016.

web.archive.org (Global: 1^st place; Danish: 1^st place)

"ITIS on Hippopotamus amphibius". Integrated Taxonomic Information System (engelsk). Arkiveret fra originalen 26. august 2014. Hentet 29. juli 2007.
Sanders, Robert (25. januar 2005). "Scientists find missing link between the dolphin, whale and its closest relative, the hippo". Science News Daily (engelsk). Arkiveret fra originalen 26. februar 2015. Hentet 8. januar 2011.
Petronio, C. (1995). "Note on the taxonomy of Pleistocene hippopotamuses" (PDF). Ibex (engelsk). 3: 53-55. Arkiveret fra originalen (PDF) 12. september 2008.
"Hippopotamus" (engelsk). Arkiveret fra originalen 8. august 2020. Hentet 2020-10-22.
"Hippopotamus Hippopotamus amphibius". National Geographic (engelsk). Arkiveret fra originalen 25. november 2014. Hentet 10. juli 2013.
"Hippopotamuses" (engelsk). PBS Nature. Arkiveret fra originalen 12. oktober 2013. Hentet 10. juli 2013.
"Oldest Hippo Turns 55!" (engelsk). Mesker Park Zoo. 12. juni 2006. Arkiveret fra originalen 27. september 2007. Hentet 21. juni 2007.
"Celebrate with Donna". Evansville Courier & Press (engelsk). 12. juli 2007. Arkiveret fra originalen 16. januar 2014. Hentet 15. juli 2007.
Fears, Danika (3. august 2012). "Goodbye, Donna: World's oldest hippo in captivity dies at 61" (engelsk). Today.com. Arkiveret fra originalen 4. juni 2013. Hentet 12. september 2013.
"Colombia kills drug baron hippo". BBC News (engelsk). 11. juli 2009. Arkiveret fra originalen 5. januar 2015. Hentet 11. juli 2009.
University of California, San Diego (29. januar 2020). "Drug lord's hippos make their mark on foreign ecosystem" (engelsk). EurekAlert. Arkiveret fra originalen 19. februar 2020. Hentet 10. februar 2020.
Miller, Greg (20. december 2013). "The Crazy, Ingenious Plan to Bring Hippopotamus Ranching to America". Wired (engelsk). ISSN 1059-1028. Arkiveret fra originalen 17. januar 2015.
Mooallem, John (2013). American Hippopotamus (engelsk). New York: The Atavist. Arkiveret fra originalen 21. februar 2014. Hentet 7. marts 2014.
Beckwitt, R.; Shea, J.; Osborne, D.; Krueger, S. & Barklow, W. (2002). "A PCR-based method for sex identification in Hippopotamus amphibius" (PDF). African Zoology (engelsk). 37 (2): 127-130. doi:10.1080/15627020.2002.11657167. Arkiveret fra originalen (PDF) 17. juni 2010.
Lewison, R (1998). "Infanticide in the hippopotamus: evidence for polygynous ungulates". Ethology, Ecology & Evolution (engelsk). 10 (3): 277-286. doi:10.1080/08927014.1998.9522857. Arkiveret fra originalen 6. marts 2011. Hentet 6. januar 2022.
Ingonyama – he is a lion! Arkiveret 21. december 2019 hos Wayback Machine. Scouting.org.za. Retrieved on 29 March 2011.
Orans, Lewis P. (17. juni 1997). "Scouting in South Africa 1884–1890" (engelsk). Pinetreeweb.com. Arkiveret fra originalen 28. juli 2014. Hentet 29. marts 2011.
Thomas, Pete (14. januar 2015). "Massive hippo charges safari boat in Malawi, Africa" (engelsk). Pete Thomas Outdoor. Arkiveret fra originalen 14. september 2025. Hentet 9. januar 2022.
"Bubbles' legacy". www.toledozoo.org (engelsk). Arkiveret fra originalen 3. maj 2015. Hentet 16. december 2015.
"Hippoquarium" (engelsk). Toledo Zoo. Arkiveret fra originalen 11. februar 2007. Hentet 26. marts 2007.

webcitation.org (Global: 25^th place; Danish: 42^nd place)

Kraul, Chris (2006-12-20). "A hippo critical situation". Los Angeles Times (engelsk). Arkiveret fra originalen 8. marts 2015. Hentet 2008-03-27.

wired.com (Global: 254^th place; Danish: 409^th place)

Miller, Greg (20. december 2013). "The Crazy, Ingenious Plan to Bring Hippopotamus Ranching to America". Wired (engelsk). ISSN 1059-1028. Arkiveret fra originalen 17. januar 2015.

worldcat.org (Global: 4^th place; Danish: 14^th place)

Okello, J.B.A; Nyakaana, S.; Masembe, C.; Siegismund, H.R.; Arctander, P. (2005). "Mitochondrial DNA variation of the common hippopotamus: evidence for a recent population expansion". Heredity (engelsk). 95 (3): 206-215. doi:10.1038/sj.hdy.6800711. ISSN 0018-067X. PMID 16030528.
Tsagkogeorga, Georgia; McGowen, Michael R.; Davies, Kalina T. J.; Jarman, Simon; Polanowski, Andrea; Bertelsen, Mads F.; Rossiter, Stephen J. (2015). "A phylogenomic analysis of the role and timing of molecular adaptation in the aquatic transition of cetartiodactyl mammals". Royal Society Open Science (engelsk). 2 (9): 150156. Bibcode:2015RSOS....250156T. doi:10.1098/rsos.150156. ISSN 2054-5703. PMC 4593674. PMID 26473040.
Miller, Greg (20. december 2013). "The Crazy, Ingenious Plan to Bring Hippopotamus Ranching to America". Wired (engelsk). ISSN 1059-1028. Arkiveret fra originalen 17. januar 2015.
Mooallem, Jon (10. august 2014). "Lake Bacon: The Story of The Man Who Wanted Us to Eat Mississippi Hippos". The Daily Beast (engelsk). ISSN 0028-9604. Hentet 13. august 2014.
Eplett, Layla (27. marts 2014). "The hunger game meat: How hippos early invaded American cuisine". Scientific American (engelsk). ISSN 0036-8733.

yahoo.com (Global: 431^st place; Danish: 1,063^rd place)

Charles, Matthew (17. januar 2021). "Colombia's rapidly breeding 'cocaine hippos' must be stopped, scientists say". news.yahoo.com (engelsk). The Telegraph. Hentet 18. januar 2021.

Flodhest (Danish Wikipedia)

abc.net.au (Global: 120th place; Danish: 267th place)

adsabs.harvard.edu (Global: 14th place; Danish: 84th place)

ui.adsabs.harvard.edu

aip.org (Global: 2,273rd place; Danish: 1,675th place)

scitation.aip.org

animaldiversity.org (Global: 1,343rd place; Danish: 2,053rd place)

archive.org (Global: 6th place; Danish: 5th place)

archive.today (Global: 28th place; Danish: 32nd place)

atavist.com (Global: low place; Danish: 9,352nd place)

periodic.atavist.com

bbc.co.uk (Global: 11th place; Danish: 19th place)

news.bbc.co.uk

bbc.com (Global: 26th place; Danish: 37th place)

bibelselskabet.dk (Global: low place; Danish: 123rd place)

books.google.com (Global: 3rd place; Danish: 13th place)

courierpress.com (Global: low place; Danish: low place)

discogs.com (Global: 73rd place; Danish: 57th place)

doi.org (Global: 2nd place; Danish: 9th place)

etymonline.com (Global: 669th place; Danish: 265th place)

eurekalert.org (Global: 3,950th place; Danish: 2,818th place)

evansvillecvb.org (Global: low place; Danish: low place)

fandom.com (Global: 902nd place; Danish: 503rd place)

madagascar.fandom.com

framingham.edu (Global: low place; Danish: low place)

fupress.net (Global: low place; Danish: low place)

gateway-africa.com (Global: low place; Danish: low place)

google.com (Global: 109th place; Danish: 235th place)

howstuffworks.com (Global: 1,354th place; Danish: 1,084th place)

animals.howstuffworks.com

innovations-report.com (Global: low place; Danish: low place)

itis.gov (Global: 241st place; Danish: 1,138th place)

iucnredlist.org (Global: 39th place; Danish: 86th place)

jhu.edu (Global: 560th place; Danish: 1,216th place)

levysheetmusic.mse.jhu.edu

journals.co.za (Global: 7,513th place; Danish: low place)

jstor.org (Global: 23rd place; Danish: 111th place)

krugerpark.co.za (Global: low place; Danish: low place)

latimes.com (Global: 32nd place; Danish: 121st place)

mountainecology.org (Global: low place; Danish: low place)

nationalgeographic.com (Global: 489th place; Danish: 304th place)

news.nationalgeographic.com

animals.nationalgeographic.com

nationalgeographic.com

newscientist.com (Global: 1,041st place; Danish: 542nd place)

nih.gov (Global: 5th place; Danish: 16th place)

pubmed.ncbi.nlm.nih.gov

ncbi.nlm.nih.gov

nla.gov.au (Global: 112th place; Danish: 579th place)

nyati-safari.dk (Global: low place; Danish: low place)

nytimes.com (Global: 7th place; Danish: 21st place)

oup.com (Global: 292nd place; Danish: 504th place)

academic.oup.com

pandaclub.dk (Global: low place; Danish: low place)

pbs.org (Global: 260th place; Danish: 334th place)

petethomasoutdoors.com (Global: low place; Danish: low place)

pinetreeweb.com (Global: low place; Danish: low place)

sarkive.com (Global: low place; Danish: low place)

sciencehistory.org (Global: 5,038th place; Danish: 3,177th place)

scientificamerican.com (Global: 1,110th place; Danish: 723rd place)

blogs.scientificamerican.com

scouting.org.za (Global: low place; Danish: low place)

scribd.com (Global: 467th place; Danish: 879th place)

semana.com (Global: 1,783rd place; Danish: 2,974th place)

sostenibilidad.semana.com

serious-science.org (Global: low place; Danish: low place)

sleepdeprived.ca (Global: low place; Danish: low place)

dragon.sleepdeprived.ca

smithsonianmagazine.com (Global: low place; Danish: low place)

theatlantic.com (Global: 322nd place; Danish: 591st place)

thedailybeast.com (Global: 517th place; Danish: 885th place)

thepolitic.org (Global: low place; Danish: low place)

today.com (Global: 773rd place; Danish: 1,661st place)

toledozoo.org (Global: low place; Danish: low place)

toonopedia.com (Global: 5,448th place; Danish: low place)

tufts.edu (Global: 192nd place; Danish: 251st place)

perseus.tufts.edu

uchicago.edu (Global: 226th place; Danish: 261st place)

penelope.uchicago.edu

ultimateungulate.com (Global: low place; Danish: 5,602nd place)

abc.net.au (Global: 120^th place; Danish: 267^th place)

adsabs.harvard.edu (Global: 14^th place; Danish: 84^th place)

aip.org (Global: 2,273^rd place; Danish: 1,675^th place)

animaldiversity.org (Global: 1,343^rd place; Danish: 2,053^rd place)

archive.org (Global: 6^th place; Danish: 5^th place)

archive.today (Global: 28^th place; Danish: 32^nd place)

atavist.com (Global: low place; Danish: 9,352^nd place)

bbc.co.uk (Global: 11^th place; Danish: 19^th place)

bbc.com (Global: 26^th place; Danish: 37^th place)

bibelselskabet.dk (Global: low place; Danish: 123^rd place)

books.google.com (Global: 3^rd place; Danish: 13^th place)

discogs.com (Global: 73^rd place; Danish: 57^th place)

doi.org (Global: 2^nd place; Danish: 9^th place)

etymonline.com (Global: 669^th place; Danish: 265^th place)

eurekalert.org (Global: 3,950^th place; Danish: 2,818^th place)

fandom.com (Global: 902^nd place; Danish: 503^rd place)

google.com (Global: 109^th place; Danish: 235^th place)

howstuffworks.com (Global: 1,354^th place; Danish: 1,084^th place)

itis.gov (Global: 241^st place; Danish: 1,138^th place)

iucnredlist.org (Global: 39^th place; Danish: 86^th place)

jhu.edu (Global: 560^th place; Danish: 1,216^th place)

journals.co.za (Global: 7,513^th place; Danish: low place)

jstor.org (Global: 23^rd place; Danish: 111^th place)

latimes.com (Global: 32^nd place; Danish: 121^st place)

nationalgeographic.com (Global: 489^th place; Danish: 304^th place)

newscientist.com (Global: 1,041^st place; Danish: 542^nd place)

nih.gov (Global: 5^th place; Danish: 16^th place)

nla.gov.au (Global: 112^th place; Danish: 579^th place)

nytimes.com (Global: 7^th place; Danish: 21^st place)

oup.com (Global: 292^nd place; Danish: 504^th place)

pbs.org (Global: 260^th place; Danish: 334^th place)

sciencehistory.org (Global: 5,038^th place; Danish: 3,177^th place)

scientificamerican.com (Global: 1,110^th place; Danish: 723^rd place)

scribd.com (Global: 467^th place; Danish: 879^th place)

semana.com (Global: 1,783^rd place; Danish: 2,974^th place)

theatlantic.com (Global: 322^nd place; Danish: 591^st place)

thedailybeast.com (Global: 517^th place; Danish: 885^th place)

today.com (Global: 773^rd place; Danish: 1,661^st place)

toonopedia.com (Global: 5,448^th place; Danish: low place)

tufts.edu (Global: 192^nd place; Danish: 251^st place)

uchicago.edu (Global: 226^th place; Danish: 261^st place)

ultimateungulate.com (Global: low place; Danish: 5,602^nd place)

umich.edu (Global: 429^th place; Danish: 657^th place)

web.archive.org (Global: 1^st place; Danish: 1^st place)

webcitation.org (Global: 25^th place; Danish: 42^nd place)

wired.com (Global: 254^th place; Danish: 409^th place)

worldcat.org (Global: 4^th place; Danish: 14^th place)

yahoo.com (Global: 431^st place; Danish: 1,063^rd place)