POMARINE JAEGER
36. Stercorarius pomarinus. 21 inches.
Jaegers are more slender in form than the Skuas, but like them are piratical in their habits, preying chiefly upon terns. Off Chatham, Mass., I have often watched them in pursuit of the graceful terns, but, excellent fliers as the latter birds are, they were always overtaken and forced to drop the fish that they carried, and the jaeger would rarely miss catching it as it fell. This species has two color phases independent of sex or age. In the light plumage the top of the head is black; rest of the upper parts and the under tail coverts brownish black; underparts and bases of primaries, white. Dark phase,—Entirely blackish brown except the white shafts to wing feathers and bases Of primaries. In any plumage they can be distinguished from the other species by the rounded, lengthened central tail feathers.
Nest.—A hollow in the ground in marshy places. The two eggs are olive brown spotted with black.
Range.—Northern hemisphere, breeding north of the Arctic Circle; winter from Mass. southward.
