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]

Hooper, E.T.; Musser, G.G. (1964). "The glans penis in Neotropical cricetines (Family Muridae) with comments on classification of muroid rodents". Miscellaneous Publications of the University of Michigan Museum of Zoology. 123: 1–57. hdl: 2027.42/56367. Winkelmann's mouse can easily be distinguished from its close relatives by the shape of its penis, which has a partially corrugated glans. [104] a b William O. Reece (2009-03-04). Functional Anatomy and Physiology of Domestic Animals. John Wiley & Sons. ISBN 9780813814513. Archived from the original on 2018-03-20. By shutting down half of their penis at a time, male echidnas fit perfectly with the female’s two-branched reproductive tract. This creature’s coat of quills don’t spare its genitalia, which features penile spines—a horrifying frequent trait in the animal kingdom (even humans once had them) which may increase fertilization success or trigger ovulation. Getting Handsy

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Mukasa-Mugerwa, E. (1981-01-01). The Camel (Camelus dromedarius): A Bibliographical Review. p.20. Archived from the original on 2014-03-26 . Retrieved 2013-11-08.

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. Reproduction". University of Wisconsin. Archived from the original on 30 July 2012 . Retrieved 3 October 2012. John A. Byers (30 June 2009). Built for Speed: A Year in the Life of Pronghorn. Harvard University Press. ISBN 978-0-674-02913-2. Archived from the original on 1 January 2014 . Retrieved 15 July 2013. Online Etymology Dictionary". Etymonline.com. Archived from the original on 2011-06-06 . Retrieved 2011-05-28.Sarkar, A. (2003). Sexual Behaviour In Animals. Discovery Publishing House. ISBN 978-81-7141-746-9.