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

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Male and female emus are similar in appearance, [13] although the male's penis can become visible when it defecates. [14] M. R. N. Prasad (1974). Männliche Geschlechtsorgane. Walter de Gruyter. pp.119–. ISBN 978-3-11-004974-9. Archived from the original on 28 May 2013 . Retrieved 23 January 2013. Daniel W. Gade (1999). Nature & Culture in the Andes. Univ of Wisconsin Press. pp.125–. ISBN 978-0-299-16124-8. Archived from the original on 28 May 2013 . Retrieved 4 March 2013. Flatworms are hermaphrodites, meaning they have both male and female sex organs, which triggers some seriously odd reproductive behavior. When trying to impregnate another worm, for example, a flatworm tries to pierce the skin of the other using its penis. Experts term this heated competition " penis fencing": The first to successfully impregnate the other while fending off advances becomes the de facto male, who wins because he won't have to expend the energy required to carry eggs.

The adult male American mink's penis is 2 + 1⁄ 4in) long, and is covered by a sheath. The baculum is well-developed, being triangular in cross section and curved at the tip. [85] Bats Vidyadaran, M. K.; etal. (1999). "Male genital organs and accessory glands of the lesser mouse deer, Tragulus javanicus" (PDF). Journal of Mammalogy. 80 (1): 199–204. doi: 10.2307/1383219. JSTOR 1383219.

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Some features of the accessory glands in the male genital region vary among oryzomyines. In Transandinomys talamancae, [97] a single pair of preputial glands is present at the penis. As is usual for sigmodontines, there are two pairs of ventral prostate glands and a single pair of anterior and dorsal prostate glands. Part of the end of the vesicular gland is irregularly folded, not smooth as in most oryzomyines. [98] Renfree, Marilyn; Hugh Tyndale-Biscoe (1987-01-30). Reproductive Physiology of Marsupials. Cambridge University Press. ISBN 9780521337922. Archived from the original on 11 January 2014 . Retrieved 5 May 2013.

Hoffmeister, Donald F. (2002). Mammals of Illinois. University of Illinois Press. ISBN 978-0-252-07083-9 . Retrieved 22 July 2013. Dolphins don’t just use their penises for baby-making, either. Bottlenose dolphins frequently copulate for pleasure, and often with members of the same sex. Dolphin sex doesn’t last long, only about ten seconds, but males can ejaculate multiple times an hour. Fencing With a Phallus Reena Mathur (2009). Animal Behaviour 3/e. Rastogi Publications. ISBN 978-81-7133-747-7. Archived from the original on 26 March 2014 . Retrieved 23 July 2013. In Transandinomys talamancae, the outer surface of the penis is mostly covered by small spines, but there is a broad band of nonspinous tissue. [96]König, Horst Erich; Liebich, Hans-Georg (2007). Veterinary Anatomy of Domestic Mammals: Textbook and Atlas. Schattauer Verlag. ISBN 978-3-7945-2485-3 . Retrieved 23 July 2013.