juvenile forster`s tern sterna forsteri sits and rests on a post sticking out of the water in the marsh at blackwater national w

america animal animals avian beak beautiful bird blackwater blue coastal estuary forster forsteri forsters habitat immature juvenile marsh maryland national natural nature nonbreeding north open outdoors outside park perch perched plumage post refuge resting sitting states sterna stick tern united usa water white wild wildlife wing wings wood young