202 



BOARD OF AGRICULTURE. [Pub. Doc. 



makes the chances of success better with the larger entrance. 

 Many boxes for this bird have been made with the entrance 

 too small. They are rarely if ever used.^ 



f — sH ^ <,--SVi 



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O 



1 



Fig. 14. — Bluebird box and details. 



^.4/4-^ 



Bluebird. — Interior dimensions, 4| by 4^ by 9| inches. En- 

 trance, 1| inches or an eighth less — never 1^ inches, as most 



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e-6---5'. 





o 



2H>^' 



ir^--^- 



I 1 



^M^i^ 



6" 



.V. 



Fig. 15. — Flicker box and details of construction. 



bluebirds will not enter a hole of this size. Long axis vertical 

 (Fig. 14). Tree swallows will use this. 



1 In May, 1915, 1 saw in Lenox a pair of chickadees feeding young in a nesting box with a round 

 entrance hole 1 inch in diameter, but the male bird was not seen to enter the box, and apparently 

 could not get in. 



