You know giraffes are tall—the tallest mammals in the world, in fact—but you may not be aware of these 20 other amazing facts about the leggy herbivores. 1. Giraffes can sprint. Over short distances, ...

Elephants can rest standing, though they usually lie down for deep sleep. Cows can sleep while standing, thanks to their powerful leg muscles that allow them to remain stable. Giraffes can take naps ...

But you don't have to wait for a meal to play with them. Since giraffes only need up to 30 minutes of sleep a day, according to the San Diego Zoo, they're almost always up for some fun.

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 ...