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 ...

Professor Lars Schmitz joins WIRED to guide us through a giant tree of life mapping the evolution of eyes in the animal kingdom: how they work, why they've taken the form they have, and the ...

Birds exhibit unihemispheric sleep, a fascinating compromise between rest and survival. One half of their brain remains alert ...