226 BIRD FRIENDS 



down the birds are driven farther out in the country 

 to nest. 



Birds using boxes. Whether any particular kind 

 of bird will use a nesting-box depends primarily on 

 its natural nesting-site. If it nests in a hollow tree 

 or limb, there is a possibility that it may occupy 

 these artificial nesting-boxes. There are other birds 

 which usually build their nests in the open that may 

 use open nesting-boxes. The birds which have been 

 actually known to nest in bird-houses, as far as the 

 author has been able to secure any records, are the 

 following : — 



Birds using nesting-houses 

 (Those marked with a * are quite common occupants) 



*Bluebirds : — 



Eastern (Sialia sialis sialis). 



Western (Sialia mexicana occidentalis) . 



Mountain (Sialia currucoides) . 

 Chickadees : — 



Black-capped (Penthestes atricapillus atricapillus) . 



Oregon (Penthestes atricapillvs occidentalis). 



Carolina (Penthestes carolinensis carolinensis) . 

 Duck, wood (Aix sponsa). 

 Finch, house (Carpodacus mexicanus frontalis) . 

 *Flicker (Colaptes auratus luteus). 

 Flycatcher, crested (Myiarchus crinitus). 

 Hawk, sparrow (Falco sparverius sparverius). 

 *Martin, purple (Progne subis subis). 

 Nuthatch, red-breasted (Sitta canadensis). 

 Nuthatch, white-breasted (Sitta carolinensis carolinensis). 

 Owl, screech (Otus asio asio). 



