That might be the reason. Have you ever had seaweed brush your ankles and all that muck squishing up between your toes?
However they eat out of the swamp, so they may not find it so icky. Maybe it's because they're standing in their food? If you were standing in a big bowl of pasta, you'd probably try to minimize the contact between your dinner and your big stinky feet.
Indeed, I saw a goose standing on one leg the other day, leading me to believe the "preserve body heat" theory since it was about 10degF out, although if I was a flamingo I wouldn't want to put both feet down in a swamp no matter what the temperature.
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