Chinstrap penguins sleep more than 10,000 times a day — but just for a few seconds — while they’re guarding their eggs, according to new research that tracked the brain activity of wild, freely behaving birds.

Chinstrap penguins sleep more than 10,000 times a day — but just for a few seconds — while they’re guarding their eggs, according to new research that tracked the brain activity of wild, freely behaving birds.