6 things to know about Earth's 6th mass extinction

School-age boy saves a species after quest to find an 'extinct' frog

How do we know what other people are thinking? This monkey study may offer clues

Vet reunites with turtle years after saving it

Today's frogs owe a debt to an ancient asteroid

Young stag beetle finds his calling as an artist

This striking African bird is showing up in California yards — and that's a problem

This heartless sea creature could help us regenerate human hearts

This photographer is saving species, one camera click at a time

Why do two-thirds of killer whale pregnancies fail?

These wild birds fashion drumsticks and make original beats

Just one little nibble ... that's all this dog wants