twenty feet high,
placed well out in the open, not less than one hundred feet from
buildings or large trees.

4. All boxes should be taken down after the nesting season and the old
nesting material removed.

_Size of Bird Boxes._--As to the size of nesting boxes for various
species, and the diameter of the entrance hole, I cannot do better than
give the dimensions {222} prepared by Ned Dearborn, of the United
States Department of Agriculture, Washington, D. C.

DIMENSIONS OF NESTING BOXES

Species Floor Depth Entrance Diameter Height
of of above of above
cavity cavity floor entrance ground

_Inches Inches Inches Inches Feet_

Bluebird 5 by 5 8 6 1 1/2 5 to 10
Robin 6 by 8 8 [1] [1] 6 to 15
Chickadee 4 by 4 8 to 10 8 1 1/8 6 to 15
Tufted Titmouse 4 by 4 8 to 10 8 1 1/4 6 to 15
White-breasted
Nuthatch 4 by 4 8 to 10 8 1 1/4 12 to 20
House Wren 4 by 4 6 to 8 1 to 6 7/8 6 to 10
Bewick Wren 4 by 4 6 to 8 1 to 6 1 6 to 10
Carolina Wren 4 by 4 6 to 8 1 to 6 1 1/8 6 to 10
Dipper 6 by 6 6 1 3 1 to 3
Violet-green
Swallow 5 by 5 6 1 to 6 1 1/2 10 to 15
Tree Swallow 5 by 5 6 1 to 6 1 1/2 10 to 15
Barn Swallow 6 by 6 6 [1] [1] 8 to 12
Martin 6 by 6 6 1 2 1/2 15 to 20
Song Sparrow 6 by 6 6 [2] [2] 1 to 3
House Finch 6 by 6 6 4 2 8 to 12
Phoebe 6 by 6 6 [1] [1] 8 to 12
Crested
Flycatcher 6 by 6 8 to 10 8 2 8 to 20
Flicker 7 by 7 16 to 18 16 2 1/2 6 to 20
Red-headed
Woodpecker 6 by 6 12 to 15 12 2 12 to 20
Golden-fronted
Woodpecker 6 by 6 12 to 15 12 2 12 to 20
Hairy Woodpecker 6 by 6 12 to 15 12 1 1/2 12 to 20
Downy Woodpecker 4 by 4 8 to 10 8 1 1/4 6 to 20
Screech Owl