‘Old murderer’ bug died 50 million years ago, fossilized with its penis intact

The broken parts of a tiny Cretaceous insect’s minuscule genitals were recently put back together after spending more than a decade apart.  Researchers have described a new species of assassin bug from a remarkably well-preserved fossil dating to around 50 million years ago. At the time of the fossil’s discovery in Colorado in 2006, it […]

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 […]