I know for a fact, by observing people and from own experience (you can try it yourself while standing, but not too consciously and in a loose way) that they (like birds), while standing, tend to do this on one leg.


closed as primarily opinion-based by rg255, WYSIWYG May 5 '16 at 10:42

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.

Browse other questions tagged or ask your own question.