(Larus philadelphia. 60.)
Back and wings, light pearl-gray; head and throat, dark slate color; back of head, neck, underparts and square tail, white; wings tipped, and bordered narrowly on the outside edge with black; feet and legs, red; bill black. Winter Plumage: Hood, grayish white. Large flocks seen in Lincoln Park. [Common Tern.]
121. COMMON TERN. 15 in.
(Sterna hirundo. 70.)
Pearly gray back and wings, whiter on rump; top of head, shining black; pure white on throat; dusky-white below; tail forked, outer edge darkest; bill long and red, blackening towards tip; feet reddish. Winter Plumage: Front of head and under-parts, white; bill nearly black. [Bonaparte Gull.]
122. AMERICAN MERGANSER. 25 in.
(Merganser americanus. 129.)
Black; rump and tail, ashy gray; head, throat and upper part of neck, greenish black; wing, largely white, edged with black and crossed by a black bar; white below, extending around the neck in a narrow collar; long red bill tipped with black; eye, red; shows salmon tinge below in flight. Female: Ashy-gray, with sharply defined brown head and neck and a pale salmon or brownish tinge across upper breast; throat, white; wings largely dark with a white patch; small crest on back of neck; feet orange; eye yellow; rare; “pursues and catches food under water.” [American Golden-eye.] [Red-breasted Merganser.]
123. RED-BREASTED MERGANSER. 22 in.
(Merganser serrator. 130.)