A few weeks ago when I was out cycling with some friends, we saw a few birds who looked like they were sleeping. Someone asked me what they were doing, and I said they were resting or sleeping but I'd ...

Birds are aflutter with activity all day long so they certainly need to rest at night – but where do they go? Other than owls ...

Every animal with a brain needs sleep — and even a few without a brain do, too. Humans sleep, birds sleep, whales sleep and even jellyfish sleep.

Frigatebirds snooze in flight while penguins take four-second catnaps Emperor penguin chicks stand together in Antarctica. Penguin parents take thousands of catnaps a day while looking after their ...

Every animal with a brain needs sleep — and even a few without a brain do, too. Humans sleep, birds sleep, whales sleep and even jellyfish sleep. Sleep is universal “even though it’s actually very ...

Researchers have tracked muscle contractions in a bird's vocal tract, and reconstructed the song it was silently singing in its sleep. The resulting audio is a very specific call, allowing the team to ...