CaspianTern
(Sterna caspia)
Photographed in Marin Headlands, California, by Jim Rosso
Caspian Terns on the left in amongst smaller Elegant Terns. Of the two Caspian Terns the bird on the left with the brownish back is an immature bird that is begging food from the adult. Notice the differences in the top of the heads of the two Elegant Terns on the right.

Charadriiformes
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Other members of the genus Sterna
Least Tern
Common Tern
Royal Tern
Elegant Tern
Sandwich Tern
Forster's Tern