26 METHODS OF ATTRACTING BIRDS 



house is intended. A circular entrance hole is to 

 be preferred. 



Bluebirds. — The boxes should be about 

 twelve by six by six inches, fastened with the 

 longer axis vertical. If a hollow limb is used, a 

 diameter of five inches, or a little less, will be 

 sufficient. The entrance hole should be one and 

 a half inches in diameter. The two-inch hole 

 often recommended is too large, as martins and 

 blue jays may enter this. Occasionally they will 

 use a smaller hole, down to one and a quarter 

 inches, but an inch and a half is the smallest 

 hole to use to make sure that the houses will be 

 occupied. Place from eight to fifteen feet high. 

 They may be fastened to trees, posts, grape- 

 arbor, tops of poles, and buildings. Put out by 

 the first of March or sooner. 



In the Eastern States the bluebird is one of the 

 most common house-tenants. Mr. Frank Bond 

 writes that in Cheyenne, Wyoming, while the 

 English sparrows were killed off, the mountain 

 bluebird was among the most common bird-box 

 occupants. In Oregon the western bluebird is a 

 common tenant. 



GMcTcadees. — The boxes should be about ten 

 by four by four inches, placed with the long axis 



