Creatures with Cocks: Hilarious Adults-Only Cartoons for Lovers of the Natural World and Dick Jokes

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The Largest Penis in the World – Both for humans and animals, size does matter! – Softpedia". News.softpedia.com. 2007-01-05. Archived from the original on 2011-05-15 . Retrieved 2011-05-28. Barry, R.E.; Shoshani, J. (2000). " Heterohyrax brucei". Mammalian Species. 645: 1–7. doi: 10.1644/1545-1410(2000)645<0001:hb>2.0.co;2. S2CID 28256848. Simpson, John, ed. (1989). "penis, n.". Oxford English Dictionary (seconded.). Oxford University Press. ISBN 978-0-19-861186-8. [ dead link] Veale, D.; Miles, S.; Bramley, S.; Muir, G.; Hodsoll, J. (2015). "Am I normal? A systematic review and construction of nomograms for flaccid and erect penis length and circumference in up to 15 521 men". BJU International. 115 (6): 978–986. doi: 10.1111/bju.13010. PMID 25487360. S2CID 36836535.

The lesser water boatman's mating call, generated by rubbing the penis against the abdomen, is the loudest sound, relative to body size, in the animal kingdom. [141] The echidna, also known as the spiny anteater, is native to Australia and New Guinea. Like its cousin the platypus, echidna females lay eggs instead of giving birth like other mammals. Scientists, however, have long been perplexed by the male anteater's mysterious sex organ, which secretes semen from four different heads. Getting all four of these into a female is impossible when fully engorged, so the echidna only insert two at any given time. Studies suggest that going halfsies may make the individual sperm swim faster. Michael L. Augee; Brett A. Gooden; Anne Musser (January 2006). Echidna: Extraordinary Egg-laying Mammal. Csiro Publishing. ISBN 978-0-643-09204-4. Archived from the original on 26 March 2014 . Retrieved 23 July 2013.McBane, Susan (2001). Modern Horse Breeding: A Guide for Owners. Globe Pequot Press. ISBN 978-1-58574-389-6. Archived from the original on 7 July 2014 . Retrieved 18 February 2014. The internal structures of the penis consist mainly of cavernous, erectile tissue, which is a collection of blood sinusoids separated by sheets of connective tissue (trabeculae). Some mammals have a lot of erectile tissue relative to connective tissue, for example horses. Because of this a horse's penis can enlarge more than a bull's penis. The urethra is on the ventral side of the body of the penis. As a general rule, a mammal's penis is proportional to its body size, but this varies greatly between species–even between closely related ones. For example, an adult gorilla's erect penis is about 4.5cm (1.8in) in length; an adult chimpanzee, significantly smaller (in body size) than a gorilla, has a penis size about double that of the gorilla. In comparison, the human penis is larger than that of any other primate, both in proportion to body size and in absolute terms. [19] Artiodactyls Johnston, S.D.; Smith, B.; Pyne, M.; Stenzel, D.; Holt, W.V. (2007). "One-Sided Ejaculation of Echidna Sperm Bundles ( Tachyglossus aculeatus)" (PDF). Am. Nat. 170 (6): E162–4. doi: 10.1086/522847. PMID 18171162. S2CID 40632746. John A. Byers (1997). American Pronghorn: Social Adaptations and the Ghosts of Predators Past. University of Chicago Press. ISBN 978-0-226-08699-6. Archived from the original on 26 March 2014 . Retrieved 23 July 2013. The most common form of genital alteration is circumcision, the removal of part or all of the foreskin for various cultural, religious, and more rarely medical reasons. There is controversy surrounding circumcision.

Plane from Israel surrounded by rioters chanting antisemitic slogans after landing in Russia's Dagestan region Leon Fradley Whitney (1952). The Raccoon. Practical Science Publishing Company. Archived from the original on 26 March 2014 . Retrieved 24 July 2013. Naugher, K. B. (2004). "Anteaters ( Myrmecophagidae)". In Hutchins, M.; Kleiman, D. G; Geist, V.; McDade, M. С. (eds.). Grzimek's Animal Life Encyclopedia. Vol.13 (2nded.). Gale. pp.171–79. ISBN 978-0-7876-7750-3. porn videos featuring scenes with various animals. Watch girl sex with animals videos and explore a brand new world of Blitz J.; Ploog D.W.; Ploog F. (1963). "Studies on the social and sexual behavior of the squirrel monkey (Saimiri sciureus)". Folia Primatologica. 1: 29–66. doi: 10.1159/000164879.

Hunsaker, Don II (2 December 2012). The Biology of Marsupials. Elsevier Science. ISBN 978-0-323-14620-3 . Retrieved 18 February 2014. Sanger TJ, Gredler ML, Cohn MJ (October 2015). "Resurrecting embryos of the tuatara, Sphenodon punctatus, to resolve vertebrate phallus evolution". Biology Letters. 11 (10): 20150694. doi: 10.1098/rsbl.2015.0694. PMC 4650183. PMID 26510679. Lienhard, Charles; Oliveira do Carmo, Thais; Lopes Ferreira, Rodrigo (2010). "A new genus of Sensitibillini from Brazilian caves (Psocodea: 'Psocoptera': Prionoglarididae)". Revue Suisse de Zoologie. 117 (4): 611–635. doi: 10.5962/bhl.part.117600. ISSN 0035-418X. Archived from the original on 2014-11-03. Leonard Lee Rue III (2004). The Deer of North America: The Standard Reference on All North American Deer Species--Behavior, Habitat, Distribution, and More. LYONS Press. ISBN 9781592284658. Archived from the original on 2013-05-28 . Retrieved 2013-05-05. Cell Press (17 April 2014). "In sex-reversed cave insects, females have the penises". Science Daily. Archived from the original on 26 April 2014 . Retrieved 27 April 2014.

Hayssen, Virginia Douglass; Tienhoven, Ari Van (1993). Asdell's Patterns of Mammalian Reproduction: A Compendium of Species-Specific Data. Cornell University Press. ISBN 978-0-8014-1753-5 . Retrieved 23 July 2013. Lukefahr, Steven D.; Cheeke, Peter R.; Patton, Nephi M. (2013). Rabbit Production. CABI. ISBN 978-1-78064-012-9 . Retrieved 20 July 2013. Charles A. Long (2008). The Wild Mammals of Wisconsin. Pensoft Publishers. p.341. ISBN 978-954-642-313-9. Archived from the original on 26 March 2014 . Retrieved 23 July 2013.

Philip Caputo (1 June 2003). Ghosts of Tsavo: Stalking the Mystery Lions of East Africa. Adventure Press, National Geographic. ISBN 978-0-7922-4100-3 . Retrieved 23 July 2013. Raccoons have penis bones which bend at a 90 degree angle at the tip. [80] The extrusibility of a raccoon's penis can be used to distinguish mature males from immature males. [81] [82] Nomadic Peoples. Commission on Nomadic Peoples. 1992. Archived from the original on 26 March 2014 . Retrieved 11 June 2013.