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Why do kangaroos have two penises?

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To go with the two sperm-vaginas, male kangaroos often have two-pronged penises. Because they have two uteruses plus a pouch, female kangaroos can be perpetually pregnant. Annotated image by Ed Yong. Also possibly important to marsupial sex lives: Kangaroos can unhinge their lower jaws. read more

Source: grist.org
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Because female kangaroos have three vaginas, two external for sperm and one internal for birth, male kangaroos often have a two-pronged penis. See the article Kangaroo genitals are weirder than you ever thought possible. read more

Source: quora.com
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Image Answers

Kangaroo penis - YouTube
Source: youtube.com

Further Research

Kangaroos have three vaginas
blogs.discovermagazine.com

Kangaroos have three vaginas – Phenomena
phenomena.nationalgeographic.com

The Three Vaginas of Kangaroos
www.themarysue.com