The joint on their legs which looks like a backwards-bending knee is actually their ankle. Their knee is higher up their leg closer to their body and is hidden by their feathers.
Flamingo chicks are born grey. They become pink in colour from a substance in the "crop milk" produced by both parents and fed to them. So while the chicks are turning pink, their parents' colour is fading. As they get older they get their pink colour from a pigment in the food they eat.
Standing on one leg
Flamingos are famous for their one-legged standing posture, and they can even sleep standing on one leg. There have been many theories about why or how they can do this. Scientists have now found that they can do this because they have a locking system in their joints that allows them to become more stable by standing on one leg rather than two.
Flamingos eat by sweeping their heads from side to side close to the water’s surface. Their beak is turned upside down in the water and their tongue acts like a pump to suck in the water. They have a comb-like structure in their beak that filters organisms from their water and then their tongue expels the water, leaving the food behind.
Chilean flamingos communicate with each other by honking or grunting.