76 BIRDS OF COLORADO. 



the mountains to 11,000 feet. The nest is repaired for the 

 season about the first of March, and the young are hatched about 

 three months later. 



352. Haliaeetus leucocephalus. Bald Eagle. 



Resident; fairly common. Mostly in the mountains in the 

 summer time and on the plains during the winter. Breeds in 

 the mountains to 9,000 feet and occasionally higher; breeds less 

 commonly on the plains. Capt. Thorne found a nest with two 

 young, June 12, near Fort Lyon on the Arkansas River. 



355. Faico mexicanus. Prairie Falcon. 



Resident ; not uncommon. Breeds from the plains to 

 10,000 feet. In some of the more open portions of western Colo- 

 rado it is quite numerous. Nearly all leave the State in the 

 winter, returning in March and April. The eggs are laid in 

 May. 



356. FaIco peregrinus anatum. Duck Hawk. 

 Resident; not uncommon, locally. Has been reported 



from many places in the State. W. P. Lowe found the nest and 

 young in St. Charles Canon, near Pueblo, during the summer 

 of 1895. Dennis Gale took a set of eggs on the Poudre River, 

 April 30, 1889. Others report it as breeding up to 10,000 feet 

 in the mountains. 



357. FaIco columbarius. Pigeon Hawk. 



Summer resident ; rather uncommon ; in migration fairly 

 common; a few remain through the winter in the lower por- 

 tions. The eggs have been taken in various parts of the State, 

 from the plains to about 9,000 feet, but more commonly from 

 8,000 to 9,000. Eggs are laid about the first of June. 



358. FaIco richardsonii. Richardson's Merlin. 

 Summer resident ; rare ; in migration not uncommon. 



There are several references to its breeding in the State, as it 

 undoubtedly does, but this seems to have been inferred from its 

 being seen here in summer rather than from its nest and eggs 

 having been actually taken. Drew states that it breeds from 

 the plains upward. It has been taken in summer as high as 

 11,000 feet. In migration occurs throughout the State. 



360. FaIco sparverius. American Sparrow Hawk. 



Resident; abundant. The most common hawk from the 

 plains to 11,000 feet. In mild winters, like that of 1895-6, 

 quite a number remain throughout the lower portions of the 

 state, but the bulk winter farther south, returning early in 

 March. Eggs are laid the latter part of April and fully fledged 



