BIRDS OF COLORADO. 127 



season and probably sometimes winters. By tlie last of March 

 has spread throughout the mountains nearly to timber-line. 

 Breeds on the plains as far east as Pueblo, more commonly at 

 the foothills and abundantly from 7,000 feet to timber-line. 

 Breeds on the plains the last of April and in the mountains 

 during May. Sometimes raises two broods. In autumn wan- 

 ders upward far above timber-line to at least 13,000 feet. Re- 

 turns late to the foothills and the bulk leave in November and 

 early December. 



