Birds resting on a beach or a wire often look calm, almost detached from what is happening around them. But that stillness ...

Some animals do it for survival, while others have evolved this ability for different reasons. It might seem strange, but these animals have developed abilities to rest while staying alert to their ...

Have you heard the saying about “sleeping with one eye open”? It’s a bit of metaphoric advice about staying vigilant—and a way to describe very light restless sleep. But sleeping with eyes open is ...

Wading through a clear knee-deep tidal pool in coastal Florida, I was trying to move slowly, to avoid disturbing a gorgeous American oystercatcher napping on a small sandbar. Oystercatchers are ...

Lock your doors, draw the curtains, and keep the lights on — these true crime shows aren’t just here to entertain, if “entertain” is even the right word. They’re here to send shivers down your spine ...