Animals that navigate extreme conditions and environments have evolved to sleep in extreme ways — for example, stealing seconds at a time during around-the-clock parenting, getting winks on the wing ...

When animals nod off, they're most vulnerable to sneaky predators. But despite the risks, the need for sleep is so strong ...

Pittsburgh Penguins goalie Arturs Silovs was given a tripping penalty for an attempted poke check just a […] The post ...

Mountain lions are adapting to their defenseless, predictable prey, which return to Patagonia seasonally to nest and breed, ...