This is a male Darter (Anhinga melanogaster) also know as the Snake Bird, for its habit of swimming with only its neck out of the water.
The long neck - and remarkably large webbed feet - allow it to hunt fish underwater. It actually uses its beak as spear and stab its prey rather then grabbing it with its beak. An interesting aspect of this birds biology is the fact that it does not (cannot actually) waterproof its feathers with naturally produced oils. This means that the birds feathers become waterlogged as it swims. This is good news as it helps the bird to sink and chase fish, but bad news because the feathers do not keep the bird warm underwater. If you have ever watched a duck pop back up to the surface of a lake and seem the water bead off its feathers you will have seen how effective the oils can be at repelling water.
The long and the short of this means that Darters have to spend a lot of time drying their feathers - and warming back up again after the chill of swimming. So the birds we see with their wings spread in classic "drying mode" it may actually be be soaking up some sun warmth after the chill of a morning spend fishing.
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