Matt S. Fantastically Wrong: Why People Used to Think Beavers Bit Off Their Own Testicles // wired.com. 2014.
Tasca C., Rapetti M., Carta M. G., Fadda B. Women and Hysteria in the History of Mental Health // Clinical Practice and Epidemiology in Mental Health. 2012. 8 (October). P. 110–119, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3480686
Wilsson L. Observations and Experiments on the Ethology of the European Beaver (Castor Fiber L.): A Study in the Development of Phylogenetically Adapted Behaviour in a Highly Specialized Mammal. Uppsala: Almqvist & Wiksell, 1971.
Beebe W. Three-Toed Sloth // Zoologica. 1926. 7.1 (25 March).
Buffon Georges-Louis Leclerc, Comte de. Natural History, General and Particular. William Wood (ed.). London: T. Cadell, 1749. Vol. 9.
Choi C. Q. Freak of Nature: Sloth Has Rib-Cage Bones in Its Neck // LiveScience.
2010. 21 October, https://www.livescience.com/10178-freak-nature-sloth-rib-cage-bones-neck.html
Cliffe R. N., Avey-Arroyo J. A., Arroyo F. J., Holton M. D., Wilson R. P. Mitigating the Squash Effect: Sloths Breathe Easily Upside Down // Biology Letters. 2014. April. 10.4, http://rsbl.royalsocietypublishing.org/content/10/4/20140172
Cliffe R. N., Haupt R. J., Avey-Arroyo J. A., Wilson R. P. Sloths Like It Hot: Ambient Temperature Modulates Food Intake in Brown-Throated Sloth (Bradypus variegatus) // PeerJ. 2015. 2 April. 3. P. e875, https://www.ncbi.nlm.nih.gov/pubmed/25861559
Conniff R. Every Creeping Thing: True Tales of Faintly Repulsive Wildlife. New York: Henry Holt, 1999.
Eisenberg J. F., Thorington Jr R. W. A Preliminary Analysis of a Neotropical Mammal Fauna // Biotropica. 1973. 5.3. P. 150–161.
Goffart M. Function and Form in the Sloth. Oxford: Pergamon Press, 1971.
Gould C. G. The Remarkable Life of William Beebe: Naturalist and Explorer. Washington, DC: Island Press, 2004.
Gould S. J. Leonardo’s Mountain of Clams and the Diet of Worms. Belknap Press, 2011.
Horne G. Sloth Fur Has a Symbiotic Relationship with Green Algae // Biomed Central blog. 14 April 2010, https://blogs.biomedcentral.com/on-biology/2010/04/14/sloth-fur-has-symbiotic-relationship-withgreen-algae
Gene M. G., Sunquist M. E. Habitat Selection and Use by Two-Toed and Three-Toed Sloths // The Ecology of Arboreal Folivores. Washington, DC: Smithsonian Institute, 1978. P. 329–359.
Oviedo y Valdés, Gonzalo Fernández de. The Natural History of the West Indies. Sterling A. Stoudemire (ed.). Chapel Hill: University of North Carolina Press, 1959. P. 54–55.
Pauli Jonathan N., Jorge E. Mendoza, Shawn A. Steffan, Cayelan C. Carey, Paul J. Weimar, M. Zachariah Peery. A Syndrome of Mutualism Reinforces the Lifestyle of a Sloth // Proceedings of the Royal Society B. 2014. 7 March. 281.1778, http://dx.doi.org/10.1098/rspb.2013.3006
Rattenborg N. C., Bryson V., Vyssotski A. L., Kays R. W., Spoelstra K., Kuemmeth F., Heidrich W., Wikelski M. Sleeping Outside the Box: Electroencephalographic Measures of Sleep in Sloths Inhabiting a Rainforest // Biology Letters. 2008. 23 August. 4.4. P. 402–405, http://rsbl.royalsocietypublishing.org/content/4/4/402
Bryson V., Kays R., Wikelski M., Lowman M. Why Do Sloths Poop on the Ground? // Treetops at Risk. Margaret Lowman, T. Levy, Soubadra Ganesh (eds.). New York: Springer, 2013. P. 195–199.
Aristotle. On the Parts of Animals. W. Ogle (trans.). London: Kegan Paul, Trench, 1882.
Baynes-Rock M. Among the Bone Eaters: Encounters with Hyenas in Harar. State College: Pennsylvania State University Press, 2015.
Benson-Amram S., Holekamp K. E. Innovative Problem Solving by Wild Spotted Hyenas // Proceedings of the Royal Society B 279 (1744). 2012. October. P. 4087–4095, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3427591
Benson-Amram S., Heinen V. K., Dryer S. L., Holekamp K. E. Numerical Assessment and Individual Call Discrimination by Wild Spotted Hyaenas, Crocuta crocuta // Animal Behaviour 82 (4). 2011. October. P. 743–752, https://doi.org/10.1016/j.anbehav.2011.07.004
Brottman M. Hyena. London: Reaktion, 2013.