322 BIRDS OF THE ROCKIES 



winter visitor ; one specimen ; natural habitat, Gulf States 

 and lower Mississippi Valley. 



339b. Red-bellied hawk. BUTEO LINEATUS ELEGANS. 

 Rare migrant ; Pacific coast species. 



342. Swainson's hawk. BUTEO SWAINSONI. Common 

 resident; breeds everywhere below 11,000 feet. 



347a. American rough-legged hawk. ARCHIBUTEO LA- 

 GOPUS SANCTI-JOHANNIS. Somewhat common winter resi- 

 dent; arrives from the north in November and remains 

 till March. 



348. Ferruginous rough-leg. ARCHIBUTEO FERRUGI- 

 NEUS. Rather common resident ; breeds on plains and 

 in mountains ; winters mostly on plains and along lower 

 streams. 



349. Golden eagle. AQUILA CHRVSAETOS. Resident; 

 common in favorable localities ; breeds from foothills to 

 12,500 feet; in winter on plains and also in mountains, 

 often at 11,000 feet. 



352. Bald eagle. HALIJEETUS LEUCOCEPHALUS. Fairly 

 common resident ; mostly in mountains in summer ; on 

 plains in winter. 



355. Prairie falcon. FALCO MEXICANUS. Not uncom- 

 mon resident; breeds from plains to 10,000 feet; quite 

 numerous in more open portions of western Colorado. 



356. Duck hawk. FALCO PEREGRINUS ANATUM. Resi- 

 dent ; not uncommon locally ; breeds up to 10,000 feet. 



357. Pigeon hawk. FALCO COLUMBARIUS. Summer resi- 

 dent ; not common ; usual breeding grounds 8,000 to 

 9,000 feet ; some breed on the plains. 



358. Richardson s merlin. FALCO RICHARDSONII. Rare 

 summer resident ; not uncommon in migration ; naturalists 



