Some were the size of a dog. Others were as large as polar bears. A newly-discovered fossil of the ferocious hyaenodont is ...

A novel system that chases larval zebrafish around an arena with predator robots is enabling scientists to understand how these days-old fish quickly learn in the real world.

KTLA 5 tracked the mountain lion’s route through a Camarillo neighborhood and captured the moment the creature leaped from one rooftop to another in a video. The ordeal started when a homeowner called ...