Evolution

grooming claw fossil and nail fossil atop human fingernail

Fossils show ancient primates had grooming claws as well as nails

Humans and other primates are outliers among mammals for having nails instead of claws. But how, when and why we transitioned from claws to nails has been an evolutionary head-scratcher. Now, new fossil evidence shows that ancient primates – inclu...
yellow-bellied sea snake

Why are there no sea snakes in the Atlantic?

Sea snakes are an evolutionary success story. With about 70 species, they’re the most diverse reptile group in the ocean, outnumbering sea turtle species 10-to-...