These animals can sleep while standing

Sounds a little weird and surprising at the same time but there are animals which can sleep while standing. 

Horses can sleep while standing and this is their strategy to become ready to escape danger.

Bisons can also sleep while standing, and they do this to keep themselves alert and safe.

Zebras have habitual to sleep while standing. This gives them the energy to run fast in case of predators coming near them.

Massive animals like elephants can also sleep while standing but they lie down for deeper sleep.

While they prefer to lie down to sleep, cows can also take a nap while standing up.

Giraffes, with tallest neck in the wild kingdom, can sleep while standing, however, they can do this only for a short period of time.

Flamingos, one of them most beautiful animals, can also sleep while standing, however they sleep while standing on one leg.

This information is not DNA's opinion but obtained from media reports