Does a legless bird that flies in the sky all its life and does not fall to the ground while sleep

Mr. Leslie Cheung's "The True Story of A Fei" has become a generation of classics, and a new term called the footless bird has appeared, which is a very wayward bird in the legend, and now it has become a literary symbol, they have fought all their lives and finally died. There are also a lot of stories and rumors.

A realistic version of the "Footless Bird".

In fact, in real life, there is also such a bird in nature, which is known as the real-life version of the footless bird, and it is rumored that it has been flying in the sky all its life without landing. The footless bird in Ah Fei's main story will only land twice in his life, once at birth and once at death, so is the real-life version of the footless bird like the rumored?

The name of this bird is swift. They are called legless birds because their feet, unlike ordinary birds, spend most of their lives flying, and their feet are of little use to them. In appearance, they are still very similar to ordinary swallows, with wings flying freely in the sky, especially the tail, which is very characteristic of swallows.

Most birds grow in two directions, the claws of the swifts grow in both the front and back directions, which makes it easier to stop and rest in the trees, but the swift's claws grow forward. It can be said that this is a major defect in their body, which causes them to be unable to stay on the branches for a long time, so they can only keep flying, and have developed a skill. Biologists speculate that swifts have this ability because if they stay on the ground for a long time, they are likely to be killed by predators, so they can only ensure their safety by flying, and over time they lose the ability to stay and jump, but have evolved to fly faster than other birds.

or related to their brains.

According to biologists, they can divide heroes more than 100 kilometers per hour, like a bolt of lightning, fleeting in the sky, the longest time they can fly for 4 or 5 months, never rest, such unique flying skills give them more chances to survive, so when will they rest now? Biologists speculate that this ability may have something to do with the evolution of swifts' brains, which can work separately, with half of the brain resting and half of the brain working normally during flight, and the brain resting alternately.

Swifts are not as exaggerated as the legendary footless birds, and biologists have yet to discover how they stop to rest on land. But they will definitely stay on the ground somehow because they need to reproduce on land. What do you think of swifts, creatures that fly in the sky?

It doesn't exist, these creatures are all made up by people, and if a bird keeps flying in the sky, it may starve to death because it doesn't get food, and there are no creatures that don't get tired.

It doesn't exist, because the wings of birds have a certain load limit, and beyond this limit, they can't continue to fly.

There are no such birds in the world, they are just made up in some literary works. The only bird in the world that comes close to the made-up bird is the swift. He spent most of his life flying.

This suddenly reminded me of Ah Fei in "Vinegar Slippery Clan". He likened himself to this kind of bird, because he himself was always on the move. In Xiaolan's words