Like water and air all creatures that live on Earth also need sleep and experts still aren’t entirely sure why. Especially considering that sleep habits of certain species vary wildly, alluding to evolutionary adaptations.
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00:00like water and air all creatures that live on earth also need sleep and experts still aren't
00:08entirely sure why especially considering that sleep habits of certain species vary wildly
00:12alluding to evolutionary adaptations take large hairy armadillos for instance a creature that
00:18spends 20 hours a day sleeping otters sleep floating on their backs in rivers lakes and oceans
00:23oftentimes holding hands as they snooze in their natural water beds bats on the other hand sleep
00:28upside down clinging to the ceilings of caves and trees however some bats like the walberg's
00:33epauletted fruit bat practice what's called unihemispheric sleep keeping one eye and half
00:38their brains awake while horses might sit down in the pasture for brief periods to rest and grab some
00:43REM sleep most of theirs is spent standing they possess a special tendon locking system that allows
00:48them to do this and gives them the ability to escape predators in the blink of an eye if need be
00:54similarly great frigate birds can sleep while flying often in short 10-second bursts they sleep
00:59more on land and use unihemispheric sleep like those bats to avoid mid-air collisions
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