Birdhouse dimensions chart – because one size doesn’t fit all

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Watching birds that stop by for birdseed is just half the fun of backyard birdwatching: There’s more enjoyment to be had when you provide a birdhouse. One size doesn’t fit all birds, but one that’s appropriately sized and well-placed will allow you to observe their family life, from nest-building to tending the young. With some luck (or a motion-activated camera), you might even see the fledglings leave their nest.

About eighty-five species of birds in the United States nest in cavities in dead or dying trees. In cities, such trees are routinely cut down and hauled away, leaving suitable nesting options in dismally short supply. (It isn’t much better outside of town—habitat destruction is already causing populations of some birds to fall.) So, providing a birdhouse (or two or three!) helps to ease their struggle.

Birds are choosy

Each species looks for a nesting place that fits within a relatively narrow range of specifications. First, it must resemble, at least superficially, a cavity in a tree. The entrance hole must be large enough to easily enter and exit, but small enough to make them feel hidden and safe. The small opening in a wren house, for example, both helps to protect from predators and also keep larger birds from taking it over.

Color matters. Numerous lovely birdhouses on the market are festooned with bright colors, ornamentation, and gadgets. But, because birds look for “trees” and camouflage, it can be harder to draw them to these. Birds, by and large, are attracted to earth tones.

You’ll find that most hardware and general merchandise stores carry birdhouses for wrens, bluebirds, Purple Martins, screech owls, and sometimes for Wood Ducks. Other sources are birdseed stores and online. Discount stores carry inexpensive birdhouses, which usually prove to be examples of getting what we pay for: wood that’s unsuitable for long-lasting use, staples instead of screws, plastics (which don’t “breathe”), and lack of an easy opening for cleaning. What to look for in a good quality birdhouse  

About thirty of the cavity-nesting species are willing to use birdhouses. This chart will help you select (or build) just the right one.

BIRDS AND THEIR NEST BOX DIMENSIONS

All measurements are in inches, except height above ground; * = prefers resting shelf;  ** = nests in a box with separate compartments

More reading:

Choose a birdhouse with these features in mind    
No spring in the step of hungry spring birds   
The plight of cavity nesting birds  

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