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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 26 March 2014 . Retrieved 23 July 2013. The good-natured swimmers have retractable penises that are kind of like multi-tools. Not only does the male dolphin's penis swivel around, but it's often also used to feel out other objects, kind of like a human hand. This gives the dolphin a "ravenous sexual appetite," says Neatorama, and could help explain why males are often seen trying to "hump inanimate objects" and "other animals like sea turtles." You just need to go look that one up,” says Willingham. You can see a video of the slugs in action here. 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] 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 human penis is made up of three columns of tissue: two corpora cavernosa lie next to each other on the dorsal side and one corpus spongiosum lies between them on the ventral side. The urethra, which is the last part of the urinary tract, traverses the corpus spongiosum, and its opening, known as the meatus / m iː ˈ eɪ t ə s/, lies on the tip of the glans penis. It is a passage both for urine and for the ejaculation of semen. All members of Carnivora (except hyenas) have a baculum. [63] Canine penises have a structure at the base called the bulbus glandis. [64] [65] In male insects, the structure analogous to a penis is known as aedeagus. The male copulatory organ of various lower invertebrate animals is often called the cirrus. [141] Linzey, Donald W. (28 December 2011). Vertebrate Biology. JHU Press. ISBN 978-1-4214-0040-2 . Retrieved 20 July 2013. Frank B. Gill (6 October 2006). Ornithology. Macmillan. pp.414–. ISBN 978-0-7167-4983-7. Archived from the original on 7 January 2014 . Retrieved 5 December 2012.

a b Dixson, AF (1989). "Sexual Selection, Genital Morphology, and Copulatory Behavior in Male Galagos". International Journal of Primatology. 1. 10: 47–55. doi: 10.1007/bf02735703. S2CID 1129069. 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 Bed bugs are famous for their aggressive, stabbing sex. Sometimes, overzealous males kill females with their saber-like penis in the process.

Sturtz, Robin; Asprea, Lori (30 July 2012). Anatomy and Physiology for Veterinary Technicians and Nurses: A Clinical Approach. John Wiley & Sons. ISBN 978-1-118-40585-7 . Retrieved 22 July 2013. Flannery, Tim (2008). Chasing Kangaroos: A Continent, a Scientist, and a Search for the World's Most Extraordinary Creature. Grove/Atlantic, Incorporated. pp.60–. ISBN 9780802143716 . Retrieved 5 May 2013. The glans penis of the marsh rice rat is long and robust, [90] averaging 7.3mm ( 9⁄ 32in) long and 4.6mm ( 3⁄ 16in) broad, and the baculum (penis bone) is 6.6mm ( 1⁄ 4in) long. [91] As is characteristic of Sigmodontinae, the marsh rice rat has a complex penis, with the distal (far) end of the baculum ending in three digits. [92] The central digit is notably larger than those at the sides. [90] The outer surface of the penis is mostly covered by small spines, but there is a broad band of nonspinous tissue. The papilla (nipple-like projection) on the dorsal (upper) side of the penis is covered with small spines, a character the marsh rice rat shares only with Oligoryzomys and Oryzomys couesi among oryzomyines examined. [93] On the urethral process, located in the crater at the end of the penis, [94] a fleshy process (the subapical lobule) is present; it is absent in all other oryzomyines with studied penes except O.couesi and Holochilus brasiliensis. [95] The baculum is deeper than it is wide. [90] Mammalogy. Jones & Bartlett Learning. 21 April 2011. pp.389–. ISBN 978-0-7637-6299-5. Archived from the original on 26 March 2014 . Retrieved 5 May 2013. José Roberto Moreira; Katia Maria P.M.B. Ferraz; Emilio A. Herrera (15 August 2012). Capybara: Biology, Use and Conservation of an Exceptional Neotropical Species. Springer. ISBN 978-1-4614-4000-0. Archived from the original on 26 March 2014 . Retrieved 25 July 2013.As with any other bodily attribute, the length and girth of the penis can be highly variable between mammals of different species. [16] [17] In many mammals, the size of a flaccid penis is smaller than its erect size.

Sometimes, penises pose logistical challenges. That is certainly the case for the leopard slug, which is so well-endowed that it has to go to extreme measures to reproduce.Carnaby, Trevor (22 January 2007). Beat About the Bush: Mammals. Jacana Media. ISBN 978-1-77009-240-2 . Retrieved 19 July 2013. Fritz R. Walther (1984). Communication and expression in hoofed mammals. Indiana University Press. ISBN 978-0-253-31380-5. Archived from the original on 12 October 2013 . Retrieved 5 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 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.

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. Berezow, Alex B. (March 2, 2015). "Is Your Penis Normal? There's a Chart for That". RealClearScience.com. RealClearScience . Retrieved April 12, 2019.

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Male orb spiders detach their penis and insert them in female spiders to impregnate them, says Jennifer Welsh at LiveScience. Having penis-detached intercourse allows the male spiders to not only escape the hungry female — who successfully eats the male 75 percent of the time — but also gives them a better chance of fending off competing males. New research suggests that without the extra weight bogging them down, the new eunuchs become "superior fighters," with enhanced endurance that gives them a better shot at surviving. Tan, Min; Gareth Jones; Guangjian Zhu; Jianping Ye; Tiyu Hong; Shanyi Zhou; Shuyi Zhang; Libiao Zhang (October 28, 2009). Hosken, David (ed.). "Fellatio by Fruit Bats Prolongs Copulation Time". PLOS ONE. 4 (10): e7595. Bibcode: 2009PLoSO...4.7595T. doi: 10.1371/journal.pone.0007595. PMC 2762080. PMID 19862320. Small, Meredith F. (1993). Female Choices: Sexual Behavior of Female Primates. Cornell University Press. ISBN 978-0-8014-8305-9 . Retrieved 23 July 2013. Winkelmann's mouse can easily be distinguished from its close relatives by the shape of its penis, which has a partially corrugated glans. [104]

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