Why do flamingos stand on one leg?
Scientists think flamingos stand on one leg mainly to save body heat and energy. Their bodies can balance on one leg with almost no muscle effort, even when asleep.
Flamingos spend long hours standing in cool water. A bird loses heat through its bare legs, so tucking one leg up against its warm body may reduce heat loss. Studies have found that flamingos stand on one leg more often when the water is cold.
A 2017 study found that the structure of a flamingo's joints lets it lock into a stable one-legged position without using much muscle. Even dead flamingos could be balanced on one leg, while it was difficult to do so on two. Living birds swayed less when standing on one leg, especially while dozing.
The backward knee myth
The joint that seems to bend backward halfway up a flamingo's leg is actually its ankle. The real knee is higher up, hidden under the feathers. Many other birds, including ducks and storks, also rest on one leg.
Did You Know?
A flamingo chick's legs are straight and gray at first, and its feathers turn pink only as it grows and eats its natural diet.