It is a resting behavior. They spend a good deal of their lives in the water and can sleep in that position. As for dominant leg most creatures have a dominant side, this is more obvious with creatures with hands.
And I am certain that flamingos don’t think about it. Having worked with them for years I can tell you that they are some of the dumbest birds on the planet. You catch / trap flamingos by walking in the opposite direction you want them to go and can literally walk them into a cage.
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