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Here is some information I found on line at: http://bit.ly/UHN2N
The largest of the terns, the Caspian Tern is one of the most widespread tern species in the world, occurring on every continent except Antarctica. It is white with a light gray mantle and white undersides. The breast and face are also white. The legs and eyes are black, and the bill is large, heavy, and bright red-orange. It has a shallowly forked tail and a slight crest that gives the head a squared-off look. In breeding plumage, the Caspian Tern sports a solid black cap, which recedes in the non-breeding season, resulting in a spray of white at the face mixing with black. Juveniles appear similar to adults in non-breeding plumage but have a lighter mantle that is mottled with light tan.