Flamingos

Why Do Flamingos Stand on One Leg?

The Circulation Theory

Alternating legs might also allow the flamingo to rest and promote circulation through both legs. The long legs of flamingos require extra work from the heart to circulate blood fully throughout the body. Especially when flamingos are standing in cool water, the heart is forced to circulate more blood to keep both legs warm. By tucking one leg closer to the body, a flamingo might reduce the load on its heart.