Eye-opening research suggests sleeping crocodiles still keep watch

Researchers in Australia and Germany find crocodiles deploy 'unilateral eye closure' while dozing in order to keep a close eye on potential threats or prey

If you ever thought you could safely tiptoe past a sleeping crocodile, please reconsider - scientists have confirmed that the fearsome reptiles sleep with one eye open.

Researchers in Australia and Germany have discovered that crocodiles can deploy "unilateral eye closure" while dozing to keep a close eye on potential threats or prey.