BIED HOUSES AND HOW TO BUILD THEM. 
19 
social. The fact that there is a limit to the possible bird population 
on any given tract must be taken into consideration. Wlien the 
probable tenants have been decided upon, the selection of sites is in 
order, for the site often decides the style of house that is to occupy it. 
In the final placing of bird houses, care should be taken to have them 
Fig. 48.—Lumber diagrams of food shelter shown in figure 46. 
face away from the winds prevailing in stormy weather. The 
strongly developed homing instincts of birds can be relied on to attach 
them to the neighborhood where they first saw the light, and the 
identical pairs which nest in the houses provided for them one year 
■will often return the next season to enjoy the same bounty and pro¬ 
tection. 
WASIIINGTO.\ : OOVKRN.MRNT rUINTlNG OFFICE: 1914 
