Flamingos are a type of wading bird in the genus Phoenicopterus, the only genus in the family Phoenicopteridae. There are four flamingo species in the Americas and two species in the Old World. Flamingos often stand on one leg, the other leg tucked beneath the body. The reason for this behaviour is not fully understood. Recent research indicates that standing on one leg may allow the birds to conserve more body heat, given that they spend a significant amount of time wading in cold water. However, the behaviour also takes place in warm water. As well as standing in the water, flamingos may stamp their webbed feet in the mud to stir up food from the bottom.