This drawing shows how the dinosaur Psittacosaurus may have used its cloacal vent (aka butthole) for signaling during courtship.
The first dinosaur butthole ever discovered is shedding light where the sun don't shine.
Although this dinosaur's caboose shares some characteristics with the backsides of some living creatures, it's also a one-of-a-kind opening, the researchers found.
It doesn't quite look like the opening on birds, which are the closest living relatives of dinosaurs.
It does look a bit like the back opening on a crocodile , he said, but it's different in some ways.
The well-preserved booty belongs to the dinosaur Psittacosaurus, a bristly tailed, Labrador-size, horn-faced dinosaur, meaning it was a relative of Triceratops .
A close-up look of the preserved Psittacosaurus cloacal vent (top) and an illustration of how it may have looked (bottom). »
