Being able to curl the leg under the body, American flamingo keeps the foot warm and conserves body heat. Flamingo stand on one leg in both cool and warm environments. American flamingos reach sexual maturity several years after birth. Breeding can occur in any season, and a flamingo may breed twice in a year. Breeding and nest building may depend on rainfall and its effect on food supply.
American flamingos perform structured preening when courtship begins.
Birds interested in each other will call to one another in unison. Male and female bounding is very strong during breeding season. American flamingos may mate with more than one partner. A flamingo's nest is made of mud, stones, straw and feathers and may be as high as 12 inches. A single egg is laid on the top of a tall mound that the female constructs.