Florida is home to a variety of both alligators and crocodiles, and in the states alligators are considered the more ferocious of the two. This isn’t the case everywhere in the world, however. Nile crocodiles have a considerably fiercer reputation than their American cousins.
Sleeping with only half your brain sounds like a great way to become a zombie in no time, but for certain marine mammals and birds, it’s a way of life. A new study suggests that crocodiles, too, may be “unihemispheric” sleepers, a finding which makes humans and other full-brain snoozers look more and more like evolutionary oddballs.