[Animals] Is it true that large animals always sleep standing up?

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Is it true that large animals always sleep standing up? Let's dig into this explanation to learn the truth behind this idea.
How is it possible that cows or buffalo can sleep in this way without falling or lying down? There is an answer to the question why large animals always sleep standing up.

Is it true that large animals always sleep standing up?
To begin with, the idea that these animals only sleep standing up is incorrect.

Most herbivorous terrestrial quadrupeds (including cows, moose, rhinos, bison, and horses) can only doze on their feet, but have to lie down to sleep soundly.

For example, when horses appear to sleep standing up, "they may be in a state of torpor or what is known as slow-wave sleep, which is not as deep as REM [rapid eye movement] sleep," he explains. Amy Johnson of the University of Pennsylvania School of Veterinary Medicine in an email.

But how do they do it? If many of us do not even contemplate the possibility of sleeping standing up on a crowded plane.

"HORSES' LEGS HAVE SOMETHING CALLED A LOCK APPARATUS," JOHNSON ADDS. «ITS LIMBS HAVE TENDON AND LIGAMENTS THAT ALLOW THE ANIMAL TO REMAIN ON ITS LEGS THROUGH MINIMUM MUSCULAR EFFORT AND THAT WAY THEY CAN STAND -AND EVEN SLEEP- FOR LONG PERIODS«.

how animals sleep
Herd animals, like bison, have another reason to stand for long periods of time: they look for signs of danger.

In a bison herd, "not all animals doze—and in any case, they don't sleep—at the same time," reports the email from Murray Woodbury, of the Western College of Veterinary Medicine, in Saskatchewan.

In this way, members of the pack that are awake and standing act as lookouts against predators and other threats.

How long should animals sleep?
The surprising thing is that some large animals need little sleep.

Giraffes can function on as little as five minutes of sleep a day. Yes, just five minutes, according to the San Diego Zoo.

And African and Asian elephants don't need to sleep much more than three hours.

However, rhinos are a bit more like us: They sleep about eight hours a day, according to reports from South Africa's Kruger National Park.

sleepy moose
Vince Crichton, a wildlife biologist (retired) at Manitoba Conservation and Water Stewardship, Canada, experienced "moose nap" up close when he fell asleep next to one.

He had been observing the behavior of a male for two days and when the animal lay down in the woods, Crichton sat close by, very carefully.

After a few hours, Mrs. Crichton rudely awoke him, asking, "Do you two intend to sleep through the afternoon?"

Man and moose had given themselves into the arms of Morpheus and neither was standing still.

https://www.ngenespanol.com/naturaleza/los-animales-grandes-siempre-duermen-parados/