Two-Foot Penis Bones: How Walruses Stay Erect in Freezing Water

Walruses won the evolutionary jackpot when it comes to penis bones, and it’s a good thing because these massive creatures need all the help they can get. So, what makes the walrus baculum unique from the rest?

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Male walruses have giant ones, but human men not at all: How we lost the penis bone
https://www.washingtonpost.com/news/morning-mix/wp/2016/12/14/male-walruses-have-giant-ones-but-human-men-not-at-all-how-we-lost-the-penis-bone/?utm_term=.fc3a114755ce
“The baculum, also called the os penis or penis bone, is a puzzling thing. It sits in the tip of the organ, not connected to any larger skeletal structure. Your pet cat has one if it is a he, as does your male dog. Many male mammals do — chimpanzees, gorillas, weasels and bears.”

Why Do Chimps Have Penis Bones When Humans Don't?
https://www.forbes.com/sites/shaenamontanari/2016/06/22/the-unusual-history-of-the-mammalian-penis-bone/#27bc67247051
“Most people are aware that human males do not have calcified bones in their penis. If this seems obvious, did you know that most other species of mammal have a bone in their penis? Well they do, and it's called a baculum.”

A Most Interesting Bone
http://phenomena.nationalgeographic.com/2013/08/08/a-most-interesting-bone/
“Let me just say at the outset that this post is about the baculum. Some of you may not want to read about the bone found in the penises of many mammal species. I want to give you a chance to head off for tamer blogs. But you might want to stick around. There’s some real science below–and some evolution in action.”

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