We can all imagine that classic image of a flamingo, gracefully perched on one leg. If you've ever wondered why they do that, there are a few reasons:
Standing on one leg allows the other leg and foot to dry. Just like humans in a bathtub, that foot starts to prune and wrinkle after a while.
It also improves their hunting technique. By standing so still on one leg, their shadow looks more like a tree, and their next meal might swim right up.
Tucking one leg in close to it's body conserves heat and energy for the flamingo. You'll notice lots of birds doing that on cooler days. Much more blood pumps through their legs than the rest of their bodies, and it helps keep them warm.
Source: Discovery Magazine
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