When birds sit quietly on a branch for long periods during winter, they are not usually sleeping but conserving energy, ...

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 ...

While it’s normal to spot nighttime creatures like mosquitoes or bats, most birds—apart from owls—tend to stay out of sight once the sun goes down. Curious about where they go and whether they ...

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 ...