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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. JSTOR2401788.
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. PMID25710445.
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. PMID12725427.
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. PMID12270790.