[Illustration: Illustrated capital F]
Following are specifications and remarks on the housing requirements of
the birds by species. For related forms not included in the table see
text.
_Table I_
Diameter Depth Diameter Distance
of from of from
interior entrance entrance ground to
(inches) (inches) (inches) entrance
(feet)
House Wren 4¼-5½ 7-9 1 8-18
Black-capped Chickadee 3¼-4 7-9 1-1/8 8-15
White-breasted Nuthatch, 3¾-4½ 8-10 1½ 12-25
Tufted Titmouse
Tree Swallow 4-5½ 6-8 1-3/8 8-30
Eastern Bluebird 4-5 8-10 1-5/8 8-20
Crested Flycatcher 5½-6½ 9-12 2-1/8 15-40
Flicker 6½-7½ 12-16 2½ 10-35
Purple Martin 6-7½ 6-8 2-1/8-2½ 12-14
Wood Duck, Hooded Merganser 7½ 12-15 4 10-20
Sparrow Hawk 6½-7 14-16 3 20-50
Saw-whet Owl 6-7½ 14-16 2-7/8 15-45
Screech Owl 7-8 14-16 3¼ 15-30
_Nesting Box_