What animals sleep standing up?

Some animals do sleep in a standing position. This behavior is often seen in animals that need to be alert at all times. Here are some animals that sleep in a standing position:

Horses: Horses can sleep in a standing position because their ligament structure and muscles are able to support their body weight.

Cows: Similar to horses, some cows can fall asleep while standing.

Birds: Some large birds, such as ostriches and some cranes, can also rest and sleep while standing.

These animals often emerge from sleep quickly and react to their surroundings, so they choose to sleep standing up for their own safety. It's worth noting that not all of these animals always sleep standing up; they also choose other positions to sleep.

animal tags：