How do horses snooze where they stand without falling over?
If you've ever passed by a field of horses at night, you've probably noticed that they rarely lie down to sleep. So why do these mammals sleep standing up?
Horses come from a long line of prey animals in the family Equidae, and sleeping on their hooves is an adaptation against predation."Standing gives them a literal jump on predators and a better chance of getting away than if they were [lying] down," Karen Waite, an equine specialist at Michigan State University, told Live Science in an email.
But while horses do most of their sleeping while standing, they do need to lie down for more restorative sleep."Horses will spend most of their time sleeping standing up, but they don't actually reach full REM sleep when they're standing," Sarah Matlock, a senior instructor of equine behavior at Colorado State University, told Live Science.
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