![]() *Entrance Height – location of hole above floor. Optimum Birdhouse Hole Size for Cavity Nesting Birds. That is, birds that build nests and lay eggs inside a cavity or sheltered chamber. Learn about the best locations for birdhouse placement and cleaning your birdhouse.īelow are some optimum hole sizes for common cavity nesting birds. However, the birds will be at more risk from predators such as European starlings which are known for killing nestlings. ![]() This is because birds in general will use a bird house with an entrance hole larger than required. If you are not sure which types of birds you want to attract, go with a larger hole size. Do you know that the diameter of the hole determines which birds will fit into the house and which birds will leave it alone? If the entrance hole is too large you might find less desirable birds are using your birdhouse. When building a birdhouse or nestbox, the hole size (entrance) is one of the most important decisions you will need to make.
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