While most birds are seen in the sky, there is only one bird that can actually live its entire life without ever having to touch the ground. It’s called the Common Swift, and it is a medium sized bird which, because of evolution, has developed the ability the never need to touch the ground.
The only time they touch down is to reproduce, and will usually cling to the side of a wall to look for a potential nest hole because their legs are so terrible at walking. These birds stay in flight night and day, hot or cold, rain or shine. In fact, the entire first two or three years of their lives are usually spent in the air!
They have a short tail in a slight fork shape and extremely long wings that resemble a boomerang and allow them to stay aloft for such lengthy periods of time. They usually live around 20 years and are known to be rather intelligent birds. The longest documented life of a Common Swift is 21 years and was estimated to have flown around 3 million miles!