It's a challenge for all new parents: Getting enough sleep while keeping a close eye on their newborns. For some penguins, it means thousands of mini-catnaps a day, researchers discovered.
Chinstrap penguins in Antarctica need to guard their eggs and chicks around-the-clock in crowded, noisy colonies. So they nod off thousands of times each day — but only for about four seconds at a time — to stay vigilant, the researchers reported Thursday in the journal Science.
