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Hi Pam:
Swans have a large number of feathers, including down feathers which protect them from even sub-freezing temperatures. The water temperature is usually warmer than the surrounding temperature (think about going into water on a cool day- once you are in you don't want to come out).
While in the water, the swans use the warmer temperature to heat their feet which have a large number of blood vessels. These capillaries promote temperature regulation for the swan's body. The marshy wetland areas that you mention provide a great habitat to protect the swans from wind. The swans will use the grasses to snuggle and provide some shelter, but the grasses will also keep the birds in a small area during heavy gusts so they do not have to fight against the wind to stay on the river.
The Regal SwanŽ Foundation, Inc.
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