For the first time, researchers have measured what is known as the ground effect of flying animals — and it turns out that they save a lot more energy by flying close to the ground than previously believed. The study supports one of the theories on how birds began to fly.
Clues to how birds began to fly
For the first time, researchers have measured what is known as the ground effect of flying animals -- and it turns out that they save a lot more energy by flying close to the ground than previously be..
