1,12 
THE CONDOR 
Vol. XVI 
Astur atricapillus atricapillus. Goshawk. I observed a pair of these 
l)irds June 29, 1911, in a heavy stand of spruce timber on Beaver Creek, in the 
Sun River country. I believe they had a nest in the vicinity. I saw another 
l)ird on the West Fork of the Sun River September 3, 1912. 
Buteo borealis calurus. Western Redtail. Common summer resident. 
'Idle commonest hawk in the mountains, but occurs rarely on the prairies. 
Nests occasionally in large firs, but much more frequently on rocky ledges ou- 
tlie faces of steep cliffs. 
Buteo swainsoni. Swainson Hawk. Common summer resident of the 
])rairies, nesting in cottonwood groves. Also found along the base of the 
mountains, Avhere it nests in the limber pines. I found one nest placed in a 
Avillow bush hut six feet from the ground. Nesting begins late in May. Mi- 
gration dates: May 1, 1912, and September 27, 1911. 
Archibuteo lagopus sancti-johannis. Rough-legged HaAvk. I observed 
this liaAvk but once : January 8, 1912. 
Archibuteo ferrugineus. Ferruginous Rough-leg. Summer resident; not 
common. A pair nest each year on the precipitous face of Priest Butte. Nest- 
ing begins early in May, and I Avas informed that this nest contained eggs and 
neAvly-hatched young on June 2, 1912. 
Aquila chrysaetos. Golden Eagle. Permanent resident. Most common 
along the bases of the mountains. 
Haliaeetus leucocephalus alascanus. Northern Bald Eagle. Rare. 1 
have seen it only in March and November, Avhen there seems to be a migration 
of this species along the foothills of the mountains. I have listed it as the sub- 
species alascanus on the strength of a mounted specimen in the Forest Service 
office at Choteau. This is a bird in juvenal plumage. It measures : AAung, 
27.5 inches, tail, 16.0 inches, and tarsus, 4.4 inches, measurements certainly 
large enough to class it Avith the northern subspecies. This bird came from a 
little outside this region, having been secured by Mr. W. H. Daugs of the For- 
est Service on the South Fork of the Flathead River, west of the continental 
diAude. 
Falco rusticolus rusticolus. Gray Gyrfalcon. I observed a bird of this 
species very closely at Collins, January 8, 1912. 
Falco mexicanus. Prairie Falcon. Summer resident in the prairie re- 
gion. A pair nested on the side of Rattlesnake Butte in 1912. 
Falco peregrinus anatum. Duck HaAvk. Rare summer resident. I saAv 
a pair near the cliffs on Priest Butte several times in the summer of 1911, and 
believe that they nested there. They Avere not present in 1912, hoAvever. 
Falco sparverius phalaena. Desert SparroAv HaAvk. Summer resident in 
the prairie region. I found a nest in an old flicker hole in a cottonAVOod near 
Choteau, in 1912. The young from this nest Avere on the Aving July 14. This 
hawk is less common here than in southern Montana. Migration dates : May 
19, 1912, and September 28, 1911. 
Pandion haliaetus carolinensis. Osprey. Observed once, along the Teton 
River, near Choteau, May 19, 1912. 
Asio flammeus. Short-eared Owl. Common summer resident of the prai- 
ries. T believe that at least four pairs nested Avithin a radius of tAvo miles of 
Choteau in 1912 (see Condor, xv, 1913, pp. 121-125). 
Bubo virginianus pallescens. Western Horned OavI. Permanent resident 
