56 | THE CONDOR Vol. XXIV 
the angle formed by the junction of the corner board and the cornice. On the 
inside the surface of the board for some six inches below the cavity has been 
pecked away for about half its thickness. The projection used by the birds 
for roosting is forty-two inches below the hole and consists of a three inch 
brace encircling the building on the interior, to which the side boards are 
nailed at a point about half-way up from the floor. This projection is littered 
with droppings for some distance each side of the hole, as is also the floor un- 
derneath. On approaching from the outside a person could hear the bird 
which was using this perch scramble up the inside of the wall to make its exit. 
d. ‘lwo and one-half by five inches. This hole is six feet from the ground 
alongside the corner-board. The crack in this case is so near the corner-board 
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Fig. 27. SKETCHES OF SEVEN ROOSTING HOLES EXCAVATED IN THE “PEST HOUSE”, 
BENICIA, CALIFORNIA, BY RED-SHAFTED FLICKERS. APPROXIMATELY 72 CUBIC 
INCHES OF WOOD HAD BEEN DISPLACED BY THE BIRDS IN THIS BUILDING, 
that it was impossible to widen the hole proportionately in each direction 
without also attacking that board. This made a two-inch thickness to pene- 
trate and accounts for the fact that the opening is so elongated. The hole opens 
directly onto a shelf, on which one of the birds roosts alongside a one-gallon 
oil ean. The shelf is covered with droppings of the birds, as is also an up- 
turned wooden tub on the floor below. 
e. One and three-quarters by six inches. This opening is eight inches 
above d, and the drop on the inside to the shelf is the same distance. Part of 
the corner board is chipped off here also. There is no apparent advantage in 
this opening, as the one below serves the same purpose. 
