May, 1914 
BIRDS OF NORTHERN MONTANA 
127 
LIST OF SPECIES 
Colymbus holboelli. Holboell Grebe. Migrant. Observed at Luliec, 
September 25-27, 1911. A carcass found at Priest Butte Lakes in the fall of 
1912. 
Colymbus nigricollis californicus. Eared Grebe. Summer resident. 
Breeds commonly in sloughs that are overgrown with rushes. No nests found, 
!)ut the birds were seen frequently with broods of young. Migration dates : 
September 4, 1911, and May 1, 1912. 
Podilymbus podiceps. Pied-billed Grebe. Seen rarely in summer. 
Probably breeds with the above species. 
Gavia immer. Loon. Rare migrant. 01)served once on Priest Butte 
Lake, May 26, 1912. 
Larus delawarensis. Ring-billed Gull, kligraiit and summer resident. 
Adult birds are seen commonly all summer about the alkaline lakes and ponds, 
but T doubt if they breed, as I have never seen young birds until late in the fall 
Fig. 40. Hudsonian and Alpine Zones, in Mountains at head of 
Biech Ceeek, Teton County, -Montana. 
migration. Probably Herring Gulls and perhaps other species occur in migra- 
tions with this species, but no others have been positively identified. Migra- 
tion dates : April 16, 1912, and November 19, 1912. 
Larus Philadelphia. Bonaparte Gull. A flock of these gulls was observed 
on an alkaline lake about ten miles from Choteau, October 31, 1912. 
Mergus americanus. Merganser. Observed on the Teton River near 
Choteau on April 16 and 17, 1912. A pair of birds seen each day. 
Mergus serrator. Red-breasted Merganser. Quite common along the 
Sun River inside the mountains, in August and September. A small flock 
observed near Choteau, May 23, 1912. 
Anas platyrhynchos. Mallard. The most abundant duck in this region. 
Nests commonly all through the prairies, and is very abundant in migrations. 
Blocks also winter commonly on sloughs where there are ivarm springs that 
