566 Colorado College Publication 



spring they are often found in company with their relatives, 

 the White-crowns, who have just arrived for the summer. 



Spizella monticola ochracea. Western Tree Sparrow. 



Winter resident; common. Arrives about the first of 

 October, the earliest date being September 22, 1912. They 

 begin to leave the last of February and early in April are 

 nearly all gone. The latest spring date is one taken by Aiken, 

 April 20, 1900. 



The Tree Sparrow is one of our commonest winter birds, 

 found everywhere about the bushy places of the foothills and 

 plains, but does not go far into the mountains in winter. While 

 it is often associated with various juncos, yet they seem dis- 

 posed to keep somewhat apart, and when a mixed flock is 

 disturbed the sparrows will often separate to a considerable 

 extent from the others. In Monument Valley Park, the winters 

 of 1911-12, many have patronized the food tables where millet 

 and other seed is put out for them. Though they come to 

 these tables in large numbers they are rather shy while there 

 and will not permit a close approach. They are not entirely 

 dependent on these tables, however, even in the park, and can 

 be seen hunting food for themselves in the weeds and grass 

 there, possibly for variety's sake. As their food is practically 

 all seeds in winter, the Tree Sparrows and Juncos destroy 

 great quantities of weed seeds during that season. 



Spizella passerina arizonae. Western Chipping Sparrow. 



Summer resident; common. Arrives April 10 to 20, the 

 earliest dates being March 23, 1900 and March 24, 1899. 

 Leaves in October, probably are about all gone by the 15th; 

 the latest fall date is October 24, 1897. 



The Chipping Sparrow is one of our most abundant sum- 

 mer residents and breeders; nests in trees and bushes along 

 streams and in gulches. Aiken noted a full fledged brood in 

 Colorado Springs June 21, 1897; very likely two broods 



