76 THE BIOLOGY OF HARDING COUNTY 



Goshawk (Astur articapillus). One seen in the Cave Hills, 

 August 12. One reported by Saunders from near Harding 

 Nov. 7. 



Sharp-shinned Hawk (Accipiter relo.r). Common during the 

 autumn migration, which commenced August 22. 



Cooper's Hawk (Accipiter cooperi). Several seen early in Sep- 

 tember along the Little Missouri Valley. 



Western Red-tail (Buteo borealis calurus). A common summer 

 resident throughout the area. 



Krider's Hawk (Buteo borealis krideri). Two were observed, 

 apparently near their nest, at the cliff of the Cave Hills. 



Swainson's Hawk (Buteo szvainsoni) . Abundant summer resi- 

 dent. 



Rough-legged Hawk (Archibnteo lagopus ^ancti-johannis). Seen 

 July 14, and three or four times during the last of August 

 and the first of September. 



Ferruginous Rough-leg (Archibnteo ferrugineus). Quite abundant 

 on the plains. Nests in the buttes. Especially numerous 

 after August 20. 



Golden Eagle (Aquila chrysaetos). A common resident about 

 the high buttes. Aeries were seen in the Cave Hills and in the 

 Short Pines. 



Bald Eagle (Haliaeetus leucocephalus). One 'seen July 20 on 

 the Little Missouri. 



Prairie Falcon (Falco mexicanus}. Abundant summer resident 

 in the badlands and elsewhere where clay cliffs occur. 



Duck Hawk (Falco peregrinns anatum). Rare. Seen twice. 



Pigeon Hawk (Falco columbarius). Rare autumn migrant along 

 the Little Missouri Valley. 



Sparrow Hawk (Falco sparverius) . Abundant summer resident 

 on the plains. 



Osprey (Pandion lialiactus carolinensis) . One seen September 2 

 . along the Little Missouri River. 



Western Horned Owl (Bubo vtrgiwianus hallcsccns'). Abundant 

 resident in the badlands and about the stepper buttes. 



.Short-eared Owl (Asio flammeus). Grinnell reported several 

 from the Little Missouri Valley. I have seen this species 

 chiefly east of the Slim Buttes and in .Perkins County. Under 

 the name of Fanning Owl it is fairly well known there. 



