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| During ], a male elephant may urinate with the penis still in the sheath, which causes the urine to spray on the hind legs.<ref name=Sukumar100>Sukumar, pp. 100–08.</ref> | During ], a male elephant may urinate with the penis still in the sheath, which causes the urine to spray on the hind legs.<ref name=Sukumar100>Sukumar, pp. 100–08.</ref> | ||
| Male dogs have a conspicuous |
Male dogs have a conspicuous penis sheath.<ref name="Schaller2009">{{cite book|author=George B. Schaller|title=The Serengeti Lion: A Study of Predator-Prey Relations|url=http://books.google.com/books?id=7ann2dYn9iYC&pg=PA329&dq=urinate+sheath+canid&hl=en&sa=X&ei=IvEXUZUCz4bRAcGugdAB&ved=0CEsQ6AEwAw#v=onepage&q=urinate%20sheath%20canid&f=false|accessdate=10 February 2013|date=15 October 2009|publisher=University of Chicago Press|isbn=978-0-226-73660-0|pages=329–}}</ref> | ||
| In stallions, the ] contracts to retract the ] into the sheath and relaxes to allow the penis to extend from the sheath.<ref>{{cite web|title=The Stallion: Breeding Soundness Examination & Reproductive Anatomy|publisher=University of Wisconsin-Madison|url=http://www.wisc.edu/ansci_repro/101equinelab/reproduction/stallion_exam.html|accessdate=7 July 2007|archiveurl=http://web.archive.org/web/20070716140038/http://www.wisc.edu/ansci_repro/101equinelab/reproduction/stallion_exam.html|archivedate=2007-07-16}}</ref> | In stallions, the ] contracts to retract the ] into the sheath and relaxes to allow the penis to extend from the sheath.<ref>{{cite web|title=The Stallion: Breeding Soundness Examination & Reproductive Anatomy|publisher=University of Wisconsin-Madison|url=http://www.wisc.edu/ansci_repro/101equinelab/reproduction/stallion_exam.html|accessdate=7 July 2007|archiveurl=http://web.archive.org/web/20070716140038/http://www.wisc.edu/ansci_repro/101equinelab/reproduction/stallion_exam.html|archivedate=2007-07-16}}</ref> | ||
Revision as of 22:01, 11 May 2013
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Almost all mammal penises have foreskins, although in non-human cases the foreskin is usually a sheath (sometimes called the preputial sheath or penile sheath) into which the whole penis is retracted. In koalas, the foreskin contains naturally occurring bacteria that play an important role in fertilization. Only monotremes (the platypus and the echidna) lack foreskins.
During musth, a male elephant may urinate with the penis still in the sheath, which causes the urine to spray on the hind legs.
Male dogs have a conspicuous penis sheath.
In stallions, the retractor penis muscle contracts to retract the stallion's penis into the sheath and relaxes to allow the penis to extend from the sheath.
References
- Edward C. Feldman (2004). Canine and feline endocrinology and reproduction. Elsevier Health Sciences. pp. 934–. ISBN 978-0-7216-9315-6. Retrieved 25 April 2013.
- The behavior guide to African mammals: including hoofed mammals, carnivores, primates. University of California Press. 1991. pp. 116–. ISBN 978-0-520-08085-0. Retrieved 25 April 2013.
- "UQ researchers unlock another koala secret". Uq.edu.au. 2001-05-09. Retrieved 2012-07-16.
- "Reproductive System". MSN Encarta. Seattle, WA, USA: Microsoft Corporation. 2006. Archived from the original on 2009-10-31.
{{cite encyclopedia}}: Unknown parameter|deadurl=ignored (|url-status=suggested) (help) - Sukumar, pp. 100–08.
- George B. Schaller (15 October 2009). The Serengeti Lion: A Study of Predator-Prey Relations. University of Chicago Press. pp. 329–. ISBN 978-0-226-73660-0. Retrieved 10 February 2013.
- "The Stallion: Breeding Soundness Examination & Reproductive Anatomy". University of Wisconsin-Madison. Archived from the original on 2007-07-16. Retrieved 7 July 2007.