Flamingos often stand on one leg, the other tucked beneath
the body. The reason for this behavior is not fully understood.
Some suggest that the flamingo, like some other animals, has
the ability to have half of its body go into a state of sleep,
and when one side is rested, the flamingo will swap leg and
then let the other half sleep, but this has not been proven.
Recent research has indicated that standing on one leg may
allow the birds to conserve more body heat, given they spend
a significant amount of time wading in cold water.