BIRD HOUSES AND HOW TO BUILD THEM. 
9 
opened for cleaning- by turning a ])utton and removing the bottom. 
"Phis house is easy to build and if suitably proportioned is adapted 
to a great variety of bu*ds. Plans are furnished for two sizes — om? 
for bluebirds and the other for 
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Fig. 22. — Diagrams of house shown in figure 19 for 
bluebirds. Thickness of boards J inch. 
screech owls or sparrow hawks. 
The flicker house shown in 
figure 23 is designed to be ])laced 
on a post or the stub of a tree. 
The roof can be lifted in the 
same way t hat a stopper is re- 
mo^ ed from a bottle. A house 
suitable for members of the 
woodpecker family and also for 
nuthatches and titmice, including chickadees, is shown in figm’e 25, 
It is attached to boles of trees. The bottom is removable, as appears 
in figure 26. 
Figure 29 shows a house designed for wrens and house finches. 
For wrens it may be placed on a tree or fence post. If attached near 
the eaves of a building, house finches or wrens 
will use it. The front gable is open, entrance 
to the room below being through the rear of 
the upper floor. This house 
can be opened for cleaning 
by lifting out the upper floor. 
Martin houses are built 
on the apartment plan to 
satisfy the social instinct so 
marked in martins but so 
conspicuously lacking in 
most other bu’ds. They 
usually contain not less than 
10 or 12 rooms and for this 
reason are relatively compli¬ 
cated, especially if they are 
miniatures of elaborate 
buildings, as is often the 
case. Like the single room 
houses, they should be easy 
to inspect and clean from 
top to bottom and, if possi¬ 
ble, should be made proof 
against the Enghsh sparrow, 
to combine these essentials in a plain house is illustrated in figure 
32. The body of this house slides upon its pole, to the top of 
which the roof is solidly attached (fig. 36). The pole is hollow and 
51982°—Bull. 609—14 -2 
Fig. 23.—Flicker house to be 
mounted on post or stub of 
tree. 
All attempt 
