Almost all birds stand on one leg. Some can even sleep while standing on one leg. Why do they do it and why don’t they fall over?
Long-legged birds, such as storks and flamingos, often stand on one leg, but so do short-legged birds, such as ducks.
Birds generally don’t have feathers on their legs. Standing on one leg reduces heat loss. Birds tuck one leg under their feathered body to keep it warm, leaving only one leg exposed.