Editor’s Note: Frank Graham was Audubon magazine's field editor for 45 years, during which time he skillfully captured the ...

Animals that navigate extreme conditions and environments have evolved to sleep in extreme ways. For a long time, scientists ...

Animals that navigate extreme conditions and environments have evolved to sleep in extreme ways — for example, stealing seconds at a time during around-the-clock parenting, getting winks on the wing ...

For years, scientists could only guess when wild animals were asleep. Now, miniaturized versions of sleep lab equipment are revealing the extreme and somewhat quirky ways animals snooze while flying, ...