Curious Minute answer
Which animal is known to sleep while standing up and can lock its legs in place to avoid falling over?
The answer
Horse
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Why it's right
Horses have a special anatomical feature called the "stay apparatus" — a system of tendons and ligaments that locks their legs in position, allowing them to doze while standing without muscular effort. They do lie down for deep REM sleep, but only for short periods.
How readers answered
A43%
B43%
C14%
D0%
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Sources: Wikipedia