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There is another special use pelicans have for their special feet, besides making them good swimmers. What is it?

Answer:

Instead of sitting on the eggs and using the warmth of their body, pelicans stand on their eggs and wrap their feet around them. This played a large part in the decline of the Brown Pelican population while DDT was being used. DDT caused birds to produce eggs with very thin shells, and when the pelicans stood on their eggs, they would break.
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