You know the feeling. It’s getting close to bedtime, you get sleepy, and you start yawning automatically. You may even find ...

These iconic rain-forest amphibians sleep by day stuck to leaf-bottoms ... Many of the animals that eat red-eyed tree frogs are nocturnal hunters that use keen eyesight to find prey.

these nocturnal frogs sleep by hanging underneath tree leaves. Their delicate, greenish transparent forms don't cast shadows, rendering them almost invisible to birds and other predators passing ...