You know the feeling. It’s getting close to bedtime, you get sleepy, and you start yawning automatically. You may even find yourself yawning in the middle of the day in a mid-day lull. These yawns ...

One of the cutest butts in the natural world undoubtedly belongs to the desert rain frog. It’s small, saggy, and looks like ...

Many scientists believe the red-eyed tree frog developed its vivid scarlet peepers to shock predators into at least briefly questioning their meal choice. These iconic rain-forest amphibians sleep ...

The overachieving Wallace's flying frog wasn't content to just hop and swim. Thousands of years of watching birds navigate the rain forest and avoid predators by taking to the sky appears to have ...