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.

Source: https://www.livescience.com/why-animal-penis-bone-ice-cream-scoop-shape.html