The Secret World of Animal Sleep: Asleep on the Wing

When birds need sleep, they do it on the fly--quite literally. They're able to enter a special kind of half-sleep state that lets them rest midair, which is especially important if you're a migratory bird, like the Alpine swift, clocking thousands of miles at a time. Glide into the astounding world of avian sleep. (3:01)

Tags

Latest Videos

Preview thumbnail for video'These Monkeys Have Complex Communication Skills
These Monkeys Have Complex Communication Skills (2:18)
Preview thumbnail for video'The Great Diving Beetle Is an Impressive Underwater Hunter
The Great Diving Beetle Is an Impressive Underwater Hunter (2:19)
Preview thumbnail for video'Arctic Fox Couple Reunites in the Freezing Cold
Arctic Fox Couple Reunites in the Freezing Cold (2:26)
Preview thumbnail for video'This River Otter Is Bracing for a Harsh Michigan Winter
This River Otter Is Bracing for a Harsh Michigan Winter (3:10)
Preview thumbnail for video'A Pair of Leopard Cubs Take Advantage of Mom's Absence
A Pair of Leopard Cubs Take Advantage of Mom's Absence (3:04)
Preview thumbnail for video'This Cactus Opens Its Petals Only One Night a Year
This Cactus Opens Its Petals Only One Night a Year (2:32)
Preview thumbnail for video'Canadian Inuits Get Their Wilderness Chops From Wolves
Canadian Inuits Get Their Wilderness Chops From Wolves (3:08)
Preview thumbnail for video'Yellowstone Bison Are Built for Winter Survival
Yellowstone Bison Are Built for Winter Survival (3:55)
Preview thumbnail for video'How a Powerful Dust Storm Made Mars 'Disappear' In 2018
How a Powerful Dust Storm Made Mars 'Disappear' In 2018 (2:06)