  
More than two dozen North American
birds will nest in bird houses. Bluebirds prefer
nest boxes on a tree stump or wooden fence post. Robins like to build their nest in the crotch of
a tree. If you don't have an appropriate tree, you can offer a
nesting platform. Chickadees and nuthatches share the same food, feeders, and
habitats. If you put a properly designed nest box in a wooded
yard, at least one pair is sure to check it out. Wrens don't seem to be very picky about where
they nest and will accept nest
boxes quite close to your house. Tree swallows prefer nest boxes attached to dead trees.
The ideal setting for these insect-eaters is on the edge of a
field near a lake, pond, or river. Violet-green
swallows nest in
forested mountains of the west; boxes placed on large trees in a
semi-open woodland will attract them. Purple martins nest in groups, so you'll need a house
with a minimum of four large rooms. You can attract all the
woodpeckers with a suet feeder, but only the flicker and the red-bellied
woodpecker are
likely to use a bird house.
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