Free Birdhouse or Nest Box plans - Dimensions and tips for constructing a birdhouse or nest box. Some species of birds are known as cavity dwellers, which means they only build their nests inside a cavity, usually a hollow inside the trunk of a tree. Manmade birdhouses (also called a nest box) provide a good simulation for a tree cavity, and have been credited for bringing the Eastern Bluebird back from the brink of extinction.
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Free Birdhouse or Nest Box plans - Dimensions and tips for constructing a birdhouse or nest box. Some species of birds are known as cavity dwellers, which means they only build their nests inside a cavity, usually a hollow inside the trunk of a tree. Manmade birdhouses (also called a nest box) provide a good simulation for a tree cavity, and have been credited for bringing the Eastern Bluebird back from the brink of extinction.
