Why do geese stand on one leg?

Answer

Geese stand on one leg to help regulate their body temperatures. This stance is used in an attempt to help the geese conserve as much body heat as possible.

Like other birds, a goose does not have warm feathers covering its legs. This lack of insulation in the lower extremities causes a decrease in body temperature. A goose lifting one foot allows the lifted leg to be closer to the bird's central body heat and warm feathers, which causes the body temperature to bump back up. This one-legged stance is rotated between legs, so each appendage has an opportunity to keep warm.

Reference:
Q&A Related to "Why do geese stand on one leg?"
Geese stand on one leg to reduce heat loss. Another possible reason is to reduce muscle fatigue though there is no experimental support on this.
http://www.kgbanswers.co.uk/why-do-geese-stand-on-...
It is commonly thought that standing on one leg might reduce fatigue in the birds' legs, or that it allows the flamingo to escape from predators more easily. Another unproven theory
http://www.ehow.com/facts_5649766_do-flamingoes-st...
There are many theories as to why flamingos stand on one leg but there is no scientific answer. They are an amazing animal and the fact that they can stand on one leg for hours at
http://www.ask.com/web-answers/Science/Biology/why...
The short and simple answer is to conserve body heat. The legs of birds receive a lot of blood and when they curl their leg up close to their body they lose a lot less heat.
http://www.quora.com/Why-do-some-birds-stand-on-on...
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