BIRDS OF COLORADO. 
127 
season and probably sometimes winters. By the 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. 
