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Scientists believe they have how flamingos on one leg. We all love the image of these beautiful birds standing in water on just one leg. The reason why the birds this has scientists for decades. Researchers in Atlanta, USA, say they have this secret of the natural world. Professor Young-Hui Chang says a flamingo can on just one leg for many hours because of its skeleton. The flamingo's hips and leg bones in a special shape and position that the bird amazing balance. Professor Chang said the flamingo's basic anatomy (bone structure) it can stand on one leg with ease. Flamingos do not have to use their muscles a lot to this.

Another researcher, Lena Ting, said the flamingo very unique because it can still for a long time on one leg. He said it would very difficult for a human to stay still without moving, even for an hour. He said: "Most of us aren't aware that we're around all the time." He added that even when we still, we actually move and a lot of energy. The muscles in our body constantly to keep us straight and us from falling over. The position of the bones in a flamingo means the birds do not to use so many muscles to keep still. This means they save energy. The researchers say that saving energy could also the reason other birds stand and sleep on one leg.