Why some animals have a penis bone shaped like an ice-cream scooper

The “penis bone,” or the baculum, is one of the most mysterious structures in mammal biology. To this day, no one really knows what it does or why it’s gone missing in humans, horses, elephants and a few other species.

A 3D analysis of 82 penis bones from different animals has now found some of the most oddly-shaped bacula could very well prolong sex, induce ovulation in the female, or shovel out sperm from other romantic encounters.

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