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

Another researcher, Lena Ting, said the flamingo is very [uniquely / unique] because it can stand [stall / still] still for a long time on one leg. He said it would be very [difficulty / difficult] for a human to stay still without moving, [even / event] for an hour. He said: "Most of us aren't aware [what / that] we're moving around all the time." He added that even when we stand still, we actually move and use [the / a] lot of energy. The muscles in our body constantly [change / changing] to keep us straight and stop us from falling over. The position of the bones in a flamingo means the birds do [never / not] need to use so [much / many] muscles to keep still. This means they save energy. The researchers say that [saving / save] energy could also be the reason other birds stand and sleep on one leg.

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