Sandwich Tern
Ad. in spring. - Whole top of the head and crest black; back and wings light pearl-gray; primaries silvery gray; the shaft part of the inner web white except at the tip; rest of the plumage white; feet and bill black, the latter with a conspicuous yellowish tip. Ad. after the breeding season and in winter.-Similar to the above, but crown white, sometimes spotted with black; back of the head and crest more or less streaked with white. Im. Similar to the preceding, but back spotted with blackish; tail slaty gray and much shorter; bill slightly if at all tipped with yellow. L., 16.00; W., 10.50; T., 5.50; B., 2.05.