Bec (Catalan Wikipedia)

Analysis of information sources in references of the Wikipedia article "Bec" in Catalan language version.

Last modified: 18:50:36, 4 September 2026 (UTC)

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archive.org (Global: 6^th place; Catalan: 15^th place)

Coues, 1890, p. 147. Coues, Elliott. Handbook of Field and General Ornithology (en anglès). Londres: Macmillan and Co, 1890. OCLC 263166207.
Gill, 1995, p. 149. Gill, Frank B. Ornithology (en anglès). 2a. edició. Nova York: W.H. Freeman and Company, 1995. ISBN 978-0-7167-2415-5.
Proctor, Noble S.; Lynch, Patrick J. Manual of ornithology: avian structure & function (en anglès). New Haven: Yale Univ. Press, 1993, p. 66. ISBN 978-0-300-07619-6.
Campbell i Lack, 1985, p. 47. Campbell, Bruce; Lack, Elizabeth. A Dictionary of Birds (en anglès). Carlton, Anglaterra: T & A.D. Poyser, 1985. ISBN 978-0-85661-039-4.
Girling, 2003, p. 4. Girling, Simon. Veterinary Nursing of Exotic Pets (en anglès). Oxford: Blackwell Publishing, 2003. ISBN 978-1-4051-0747-1.
Samour, 2000, p. 296. Samour, Jaime. Avian Medicine (en anglès). Londres: Mosby, 2000. ISBN 978-0-7234-2960-9.
Beddard, Frank E. (Frank Evers). The structure and classification of birds (en anglès). Londres, Nova York: Longmans, Green, and co., 1898, p. 5.
Campbell i Lack, 1985, p. 598. Campbell, Bruce; Lack, Elizabeth. A Dictionary of Birds (en anglès). Carlton, Anglaterra: T & A.D. Poyser, 1985. ISBN 978-0-85661-039-4.
Harris, Tony; Franklin, Kim. Shrikes & bush-shrikes: including wood-shrikes, helmet-shrikes, flycatcher-shrikes, philentomas, batises and wattle-eyes. Londres: Christopher Helm, 2000. ISBN 978-0-7136-3861-5.
Campbell i Lack, 1985, p. 48. Campbell, Bruce; Lack, Elizabeth. A Dictionary of Birds (en anglès). Carlton, Anglaterra: T & A.D. Poyser, 1985. ISBN 978-0-85661-039-4.
Madge, Steve; Burn, Hilary. Wildfowl: an identification guide to the ducks, geese and swans of the world (en anglès). Londres: Christopher Helm, 1988, p. 143-144. ISBN 978-0-7470-2201-5.
Identification guide to North American passerines: a compendium of information on identifying, ageing, and sexing passerines in the hand (en anglès). Bolinas, Calif: Slate Creek Press, 1987, p. 6-7. ISBN 978-0-9618940-0-9.
Campbell i Lack, 1985, p. 127. Campbell, Bruce; Lack, Elizabeth. A Dictionary of Birds (en anglès). Carlton, Anglaterra: T & A.D. Poyser, 1985. ISBN 978-0-85661-039-4.
Coues, Elliott. Handbook Of Field And General Ornithology (en anglès). Londres: Macmillan and Co, 1890, p. 1, 147, 151–152, 155. OCLC 263166207.
Coues, 1890, p. 152. Coues, Elliott. Handbook of Field and General Ornithology (en anglès). Londres: Macmillan and Co, 1890. OCLC 263166207.
Campbell i Lack, 1985, p. 342. Campbell, Bruce; Lack, Elizabeth. A Dictionary of Birds (en anglès). Carlton, Anglaterra: T & A.D. Poyser, 1985. ISBN 978-0-85661-039-4.
Coues, 1890, p. 155. Coues, Elliott. Handbook of Field and General Ornithology (en anglès). Londres: Macmillan and Co, 1890. OCLC 263166207.
Campbell i Lack, 1985, p. 105. Campbell, Bruce; Lack, Elizabeth. A Dictionary of Birds (en anglès). Carlton, Anglaterra: T & A.D. Poyser, 1985. ISBN 978-0-85661-039-4.
Capainolo, Peter; Butler, Carol A. How fast can a falcon dive? fascinating answers to questions about birds of prey (en anglès). New Brunswick, N.J: Rutgers University Press, 2010, p. 51. ISBN 978-0-8135-4790-9.
Campbell i Lack, 1985, p. 375. Campbell, Bruce; Lack, Elizabeth. A Dictionary of Birds (en anglès). Carlton, Anglaterra: T & A.D. Poyser, 1985. ISBN 978-0-85661-039-4.
Ehrlich, Paul R; Dobkin, David S; Wheye, Darryl. The birder's handbook: a field guide to the natural history of North American birds: including all species that regularly breed north of Mexico. Nova York: Simon & Schuster, 1988, p. 209. ISBN 978-0-671-62133-9.
del Hoyo, Josep; Carboneras, Carlos; Elliott, Andrew; Sargatal, Jordi. Handbook of Birds of the World. Family Diomedeidae (Albatrosses) (en anglès). vol. 1. Barcelona: Lynx Edicions, 1992, p. 199. ISBN 978-84-87334-10-8.
Capainolo, Peter; Butler, Carol A. How fast can a falcon dive? fascinating answers to questions about birds of prey (en anglès). New Brunswick, N.J: Rutgers University Press, 2010, p. 51. ISBN 978-0-8135-4790-9.
Gill, 1995, p. 117. Gill, Frank B. Ornithology (en anglès). 2a. edició. Nova York: W.H. Freeman and Company, 1995. ISBN 978-0-7167-2415-5.
Tudge, Colin; Milloy, Jane; Tudge, Colin. The bird: a natural history of who birds are, where they came from, and how they live (en anglès). 1st American ed. Nova York: Crown Publishers, 2008, p. 140. ISBN 978-0-307-34204-1.
Kaplan, Gisela T. Tawny frogmouth (en anglès). Collingwood, Victoria: Csiro Publishing, 2007, p. 50. ISBN 978-0-643-09239-6.
Campbell i Lack, 1985, p. 84. Campbell, Bruce; Lack, Elizabeth. A Dictionary of Birds (en anglès). Carlton, Anglaterra: T & A.D. Poyser, 1985. ISBN 978-0-85661-039-4.
Coues, 1890, p. 151. Coues, Elliott. Handbook of Field and General Ornithology (en anglès). Londres: Macmillan and Co, 1890. OCLC 263166207.
Leopold, Aldo Starker; Schwartz, Charles W. Wildlife of Mexico. The game birds and mammals: Chapter 1 (en anglès). Oxford: Univ. of California Press, 1972, p. 202. ISBN 978-0-520-00724-6.
Alderton, David. A Birdkeeper's Guide to Budgies (en anglès). Tetra Press, 1996, p. 12.
Perrins, Christopher M. Birds. Londres: Collins, 1974, p. 24. ISBN 978-0-00-212173-6.
Campbell i Lack, 1985, p. 178. Campbell, Bruce; Lack, Elizabeth. A Dictionary of Birds (en anglès). Carlton, Anglaterra: T & A.D. Poyser, 1985. ISBN 978-0-85661-039-4.
Perrins, Christopher M.; Attenborough, David; Arlott, Norman. New generation guide to the birds of Britain and Europe (en anglès). 1st University of Texas Press ed. Austin: University of Texas Press, 1987, p. 205. ISBN 978-0-292-75532-1.
Gill, 1995, p. 427. Gill, Frank B. Ornithology (en anglès). 2a. edició. Nova York: W.H. Freeman and Company, 1995. ISBN 978-0-7167-2415-5.
Gill, 1995, p. 428. Gill, Frank B. Ornithology (en anglès). 2a. edició. Nova York: W.H. Freeman and Company, 1995. ISBN 978-0-7167-2415-5.
Kaiser, Gary W. The inner bird: anatomy and evolution (en anglès). Vancouver: UBC Press, 2007, p. 26. ISBN 978-0-7748-1344-0.
Hill, 2010, p. 62. Hill, Geoffrey E. Bird Coloration (en anglès). Washington, DC: National Geographic, 2010. ISBN 978-1-4262-0571-2.
Hill, 2010, p. 63. Hill, Geoffrey E. Bird Coloration (en anglès). Washington, DC: National Geographic, 2010. ISBN 978-1-4262-0571-2.
Hill, 2010, p. 64. Hill, Geoffrey E. Bird Coloration (en anglès). Washington, DC: National Geographic, 2010. ISBN 978-1-4262-0571-2.
Hill, 2010, p. 66. Hill, Geoffrey E. Bird Coloration (en anglès). Washington, DC: National Geographic, 2010. ISBN 978-1-4262-0571-2.
Rogers i Kaplan, 2000, p. 155. Rogers, Lesley J; Kaplan, Gisela T. Songs, Roars and Rituals: Communication in birds, mammals and other animals (en anglès). Boston, MA: Harvard University Press, 2000. ISBN 978-0-674-00827-4.
Howell, 2007, p. 23. Howell, Steve N. G. Gulls of the Americas (en anglès). Nova York: Houghton Mifflin Company, 2007. ISBN 978-0-618-72641-7.
Campbell, Bernard Grant. Sexual Selection and the Descent of Man: The Darwinian pivot (en anglès). 2a. ed.. Chicago, Ill: Aldine Publ. Co, 1977, p. 186. ISBN 978-0-202-02005-1.
Thompson, Bill; Eirik, A.T; Gordon, Jeffrey A. Identify yourself: the 50 most common birding identification challenges (en anglès). Boston: Houghton Mifflin, 2005, p. 128. ISBN 978-0-618-51469-4.
Howell, 2007, p. 21. Howell, Steve N. G. Gulls of the Americas (en anglès). Nova York: Houghton Mifflin Company, 2007. ISBN 978-0-618-72641-7.
Samour, 2000, p. 7. Samour, Jaime. Avian Medicine (en anglès). Londres: Mosby, 2000. ISBN 978-0-7234-2960-9.
Rogers i Kaplan, 2000, p. 20. Rogers, Lesley J; Kaplan, Gisela T. Songs, Roars and Rituals: Communication in birds, mammals and other animals (en anglès). Boston, MA: Harvard University Press, 2000. ISBN 978-0-674-00827-4.
Rogers i Kaplan, 2000, p. 83. Rogers, Lesley J; Kaplan, Gisela T. Songs, Roars and Rituals: Communication in birds, mammals and other animals (en anglès). Boston, MA: Harvard University Press, 2000. ISBN 978-0-674-00827-4.
Terres, John K.; Amadon, Dean. The Audubon Society encyclopedia of North America birds. Nova York: A. A. Knopf, 1980. ISBN 978-0-394-46651-4.
Schreiber, Elizabeth Anne; Burger, Joanna. Biology of marine birds (en anglès). Boca Raton, Florida: CRC Press, 2002, p. 325. ISBN 978-0-8493-9882-7.
Armstrong, 1965, p. 7. Armstrong, Edward Allworthy. Bird Display and Behaviour: An introduction to the study of bird psychology (en anglès). Nova York: Dover Publications, 1965. LCCN 64013457.
Partridge, Eric. Shakespeare's bawdy (en anglès). Londres; Nova York: Routledge, 2001, p. 82. ISBN 978-0-415-25553-0.

biologists.com (Global: low place; Catalan: 6,621^st place)

journals.biologists.com

Ito, Yoshihiro; Yeo, Jae Yong; Chytil, Anna; Han, Jun; Bringas, Pablo «Conditional inactivation of Tgfbr2 in cranial neural crest causes cleft palate and calvaria defects» (en anglès). Development, 130, 21, 01-11-2003, p. 5269–5280. DOI: 10.1242/dev.00708. ISSN: 1477-9129.

bioone.org (Global: 1,999^th place; Catalan: 834^th place)

Pitocchelli, Jay; Piatt, John F.; Carter, Harry R. «Variation in plumage, molt, and morphology of the Whiskered Auklet (Aethia pygmaea) in Alaska» (en anglès). Journal of Field Ornithology, 74, 1, 1-2003, p. 90–98. DOI: 10.1648/0273-8570-74.1.90. ISSN: 0273-8570.
Borras, A.; Pascual, J.; Senar, J. C. «WHAT DO DIFFERENT BILL MEASURES MEASURE AND WHAT IS THE BEST METHOD TO USE IN GRANIVOROUS BIRDS?» (en anglès). Journal of Field Ornithology, 71, 4, 10-2000, p. 606–611. DOI: 10.1648/0273-8570-71.4.606. ISSN: 0273-8570.

books.google.cat (Global: 516^th place; Catalan: 3^rd place)

Lawrence, Eleanor. Henderson's dictionary of biology (en anglès). 14th ed. Harlow, England ; Nova York: Pearson Benjamin Cummings Prentice Hall, 2008, p. 111. ISBN 978-0-321-50579-8.

brill.com (Global: 814^th place; Catalan: 759^th place)

Noble; Davies; Hartley; McRae «THE RED GAPE OF THE NESTLING CUCKOO (CUCULUS CANORUS) IS NOT A SUPERNORMAL STIMULUS FOR THREE COMMON HOSTS». Behaviour, 136, 6, 1999, p. 759–777. DOI: 10.1163/156853999501559. ISSN: 0005-7959.

britishbirds.co.uk (Global: low place; Catalan: low place)

Pomeroy, D. E. «Birds with abnormal bills» (en anglès). vol. 55 (2) p. 49–72. British Birds, 01-02-1962.

bwdmagazine.com (Global: low place; Catalan: low place)

Zickefoose, Julie «Backyard Mystery Birds». Birdwatcher's digest. Bird Watcher's Digest.

cabidigitallibrary.org (Global: low place; Catalan: low place)

Grandin, Temple. Improving animal welfare: a practical approach (en anglès). Wallingford: CABI, 2010, p. 110. ISBN 978-1-84593-541-2.

doi.org (Global: 2^nd place; Catalan: 4^th place)

dx.doi.org

Seki, Yasuaki; Bodde, Sara G.; Meyers, Marc A. «Toucan and hornbill beaks: A comparative study» (en anglès). Acta Biomaterialia, 6, 2, 2-2010, p. 331–343. DOI: 10.1016/j.actbio.2009.08.026.
Bonser, Richard H. C; Witter, Mark S «Indentation Hardness of the Bill Keratin of the European Starling». The Condor, 95, 3, 8-1993, p. 736–738. DOI: 10.2307/1369622. ISSN: 1938-5129.
Pitocchelli, Jay; Piatt, John F.; Carter, Harry R. «Variation in plumage, molt, and morphology of the Whiskered Auklet (Aethia pygmaea) in Alaska» (en anglès). Journal of Field Ornithology, 74, 1, 1-2003, p. 90–98. DOI: 10.1648/0273-8570-74.1.90. ISSN: 0273-8570.
Knopf, F. L. «Schedule of Presupplemental Molt of White Pelicans with Notes on the Bill Horn». The Condor, 77, 3, 10-1975, p. 356–359. DOI: 10.2307/1366249. ISSN: 1938-5129.
Chernova, O. F.; Fadeeva, E. O. «The peculiar architectonics of contour feathers of the emu (Dromaius novaehollandiae, Struthioniformes)» (en anglès). Doklady Biological Sciences, 425, 1, 4-2009, p. 175–179. DOI: 10.1134/S0012496609020264. ISSN: 0012-4966.
Hieronymus, Tobin L.; Witmer, Lawrence M. «Homology and Evolution of Avian Compound Rhamphothecae» (en anglès). The Auk, 127, 3, 7-2010, p. 590–604. DOI: 10.1525/auk.2010.09122.
Stettenheim, Peter R. «The Integumentary Morphology of Modern Birds—An Overview» (en anglès). American Zoologist, 40, 4, 8-2000, p. 461–477. DOI: 10.1093/icb/40.4.461. ISSN: 0003-1569.
Klasing, Kirk C. «Avian gastrointestinal anatomy and physiology» (en anglès). Seminars in Avian and Exotic Pet Medicine, 8, 2, 4-1999, p. 42–50. DOI: 10.1016/S1055-937X(99)80036-X.
Borras, A.; Pascual, J.; Senar, J. C. «WHAT DO DIFFERENT BILL MEASURES MEASURE AND WHAT IS THE BEST METHOD TO USE IN GRANIVOROUS BIRDS?» (en anglès). Journal of Field Ornithology, 71, 4, 10-2000, p. 606–611. DOI: 10.1648/0273-8570-71.4.606. ISSN: 0273-8570.
Wheelwright, Nathaniel T. «Fruit‐Size, Gape Width, and the Diets of Fruit‐Eating Birds» (en anglès). Ecology, 66, 3, 6-1985, p. 808–818. DOI: 10.2307/1940542. ISSN: 0012-9658.
Soler, Juan J.; Avilés, Jesús M. «Sibling Competition and Conspicuousness of Nestling Gapes in Altricial Birds: A Comparative Study» (en anglès). PLoS ONE, 5, 5, 06-05-2010. e10509. DOI: 10.1371/journal.pone.0010509. ISSN: 1932-6203. PMC: PMC2865545. PMID: 20463902.
Hauber, Mark E.; Kilner, Rebecca M. «Coevolution, communication, and host chick mimicry in parasitic finches: who mimics whom?» (en anglès). Behavioral Ecology and Sociobiology, 61, 4, 22-01-2007, p. 497–503. DOI: 10.1007/s00265-006-0291-0. ISSN: 0340-5443.
Hunt, Sarah; Kilner, Rebecca M.; Langmore, Naomi E.; Bennett, Andrew T. D. «Conspicuous, ultraviolet-rich mouth colours in begging chicks» (en anglès). Proceedings of the Royal Society of London. Series B: Biological Sciences, 270, suppl_1, 07-08-2003. DOI: 10.1098/rsbl.2003.0009. ISSN: 0962-8452. PMC: PMC1698012. PMID: 12952627.
Schuetz, Justin G. «Reduced growth but not survival of chicks with altered gape patterns: implications for the evolution of nestling similarity in a parasitic finch» (en anglès). Animal Behaviour, 70, 4, 10-2005, p. 839–848. DOI: 10.1016/j.anbehav.2005.01.007.
Saino, Nicola; Ambrosini, Roberto; Martinelli, Roberta; Ninni, Paola; Møller, Anders Pape «Gape coloration reliably reflects immunocompetence of barn swallow (Hirundo rustica) nestlings» (en anglès). Behavioral Ecology, 14, 1, 01-01-2003, p. 16–22. DOI: 10.1093/beheco/14.1.16. ISSN: 1465-7279.
Noble; Davies; Hartley; McRae «THE RED GAPE OF THE NESTLING CUCKOO (CUCULUS CANORUS) IS NOT A SUPERNORMAL STIMULUS FOR THREE COMMON HOSTS». Behaviour, 136, 6, 1999, p. 759–777. DOI: 10.1163/156853999501559. ISSN: 0005-7959.
Tanaka, Keita D.; Morimoto, Gen; Ueda, Keisuke «Yellow wing‐patch of a nestling Horsfield's hawk cuckoo Cuculus fugax induces miscognition by hosts: mimicking a gape?» (en anglès). Journal of Avian Biology, 36, 5, 9-2005, p. 461–464. DOI: 10.1111/j.2005.0908-8857.03439.x. ISSN: 0908-8857.
Bock, Walter J. «Organisms as Functional Machines: A Connectivity Explanation» (en anglès). American Zoologist, 29, 3, 8-1989, p. 1119-1132. DOI: 10.1093/icb/29.3.1119. ISSN: 0003-1569.
Mougeot, François; Arroyo, Beatriz E «Ultraviolet reflectance by the cere of raptors» (en anglès). Biology Letters, 2, 2, 22-06-2006, p. 173–176. DOI: 10.1098/rsbl.2005.0434. ISSN: 1744-9561. PMC: PMC1618910. PMID: 17148356.
Parejo, Deseada; Avilés, Jesús M.; Rodríguez, Juan «Visual cues and parental favouritism in a nocturnal bird» (en anglès). Biology Letters, 6, 2, 23-04-2010, p. 171–173. DOI: 10.1098/rsbl.2009.0769. ISSN: 1744-9561. PMC: PMC2865047. PMID: 19864276.
Conover, Michael R.; Miller, Don E. «Rictal Bristle Function in Willow Flycatcher». The Condor, 82, 4, 11-1980, p. 469. DOI: 10.2307/1367580.
Cunningham, Susan J.; Alley, Maurice R.; Castro, Isabel «Facial bristle feather histology and morphology in New Zealand birds: Implications for function» (en anglès). Journal of Morphology, 272, 1, 1-2011, p. 118–128. DOI: 10.1002/jmor.10908. ISSN: 0362-2525.
Ralph, Charles L. «The Control of Color in Birds» (en anglès). American Zoologist, 9, 2, 5-1969, p. 521–530. DOI: 10.1093/icb/9.2.521. ISSN: 0003-1569.
Jouventin, Pierre; Nolan, Paul M.; Örnborg, Jonas; Dobson, F. Stephen «ULTRAVIOLET BEAK SPOTS IN KING AND EMPEROR PENGUINS» (en anglès). The Condor, 107, 1, 2005, p. 144. DOI: 10.1650/7512. ISSN: 0010-5422.
Bhullar, Bhart-Anjan S.; Morris, Zachary S.; Sefton, Elizabeth M.; Tok, Atalay; Tokita, Masayoshi «A molecular mechanism for the origin of a key evolutionary innovation, the bird beak and palate, revealed by an integrative approach to major transitions in vertebrate history: DEVELOPMENTAL MECHANISM FOR ORIGIN OF BIRD BEAK» (en anglès). Evolution, 69, 7, 7-2015, p. 1665–1677. DOI: 10.1111/evo.12684.
Abzhanov, Arhat; Protas, Meredith; Grant, B. Rosemary; Grant, Peter R.; Tabin, Clifford J. «Bmp4 and Morphological Variation of Beaks in Darwin's Finches» (en anglès). Science, 305, 5689, 03-09-2004, p. 1462–1465. DOI: 10.1126/science.1098095. ISSN: 0036-8075.
Abzhanov, Arhat; Kuo, Winston P.; Hartmann, Christine; Grant, B. Rosemary; Grant, Peter R. «The calmodulin pathway and evolution of elongated beak morphology in Darwin's finches» (en anglès). Nature, 442, 7102, 8-2006, p. 563–567. DOI: 10.1038/nature04843. ISSN: 0028-0836.
Ito, Yoshihiro; Yeo, Jae Yong; Chytil, Anna; Han, Jun; Bringas, Pablo «Conditional inactivation of Tgfbr2 in cranial neural crest causes cleft palate and calvaria defects» (en anglès). Development, 130, 21, 01-11-2003, p. 5269–5280. DOI: 10.1242/dev.00708. ISSN: 1477-9129.
Mallarino, Ricardo; Grant, Peter R.; Grant, B. Rosemary; Herrel, Anthony; Kuo, Winston P. «Two developmental modules establish 3D beak-shape variation in Darwin's finches» (en anglès). Proceedings of the National Academy of Sciences, 108, 10, 08-03-2011, p. 4057–4062. DOI: 10.1073/pnas.1011480108. ISSN: 0027-8424. PMC: PMC3053969. PMID: 21368127.
Clayton, Dale H.; Lee, Patricia L. M.; Tompkins, Daniel M.; Brodie III, Edmund D. «Reciprocal Natural Selection on Host‐Parasite Phenotypes» (en anglès). The American Naturalist, 154, 3, 9-1999, p. 261–270. DOI: 10.1086/303237. ISSN: 0003-0147.
Boyd, Elizabeth M. «A Survey of Parasitism of the Starling Sturnus vulgaris L. in North America». The Journal of Parasitology, 37, 1, 2-1951, p. 56. DOI: 10.2307/3273522.
Ash, J. S. «A STUDY OF THE MALLOPHAGA OF BIRDS WITH PARTICULAR REFERENCE TO THEIR ECOLOGY» (en anglès). Ibis, 102, 1, 1-1960, p. 93–110. DOI: 10.1111/j.1474-919X.1960.tb05095.x. ISSN: 0019-1019.
Clayton, Dale H; Moyer, Brett R; Bush, Sarah E; Jones, Tony G; Gardiner, David W «Adaptive significance of avian beak morphology for ectoparasite control» (en anglès). Proceedings of the Royal Society B: Biological Sciences, 272, 1565, 22-04-2005, p. 811–817. DOI: 10.1098/rspb.2004.3036. ISSN: 0962-8452. PMC: PMC1599863. PMID: 15888414.
Moyer, Brett R.; Peterson, A. Townsend; Clayton, Dale H. «INFLUENCE OF BILL SHAPE ON ECTOPARASITE LOAD IN WESTERN SCRUB-JAYS» (en anglès). The Condor, 104, 3, 2002, p. 675. DOI: 10.1650/0010-5422(2002)104[0675:IOBSOE]2.0.CO;2. ISSN: 0010-5422.
Clayton, D. H.; Walther, B. A. «Influence of host ecology and morphology on the diversity of Neotropical bird lice» (en anglès). Oikos, 94, 3, 9-2001, p. 455–467. DOI: 10.1034/j.1600-0706.2001.940308.x. ISSN: 0030-1299.
Tattersall, Glenn J.; Andrade, Denis V.; Abe, Augusto S. «Heat Exchange from the Toucan Bill Reveals a Controllable Vascular Thermal Radiator» (en anglès). Science, 325, 5939, 24-07-2009, p. 468–470. DOI: 10.1126/science.1175553. ISSN: 0036-8075.
Greenberg, Russell; Danner, Raymond; Olsen, Brian; Luther, David «High summer temperature explains bill size variation in salt marsh sparrows» (en anglès). Ecography, 35, 2, 2-2012, p. 146–152. DOI: 10.1111/j.1600-0587.2011.07002.x. ISSN: 0906-7590.
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