This skull belongs to the carnivorous gorgonopsian therapsid Smilesaurus ferox which lived 255 million years ago. Cradle of Humankind/Flickr/Wikimedia

You can thank our pre-mammalian ancestors for your sexy teeth

Modern sabre-tooth mammals have their canines constantly on display. This allows them to seduce mates. But was sexual selection also an important phenomenon among our pre-mammalian ancestors?

More Analysis and Comment