Barn Swallow House
My father is building an "apartment" for barns and
swallows to enjoy. He is wondering how large to drill the holes. He believes the
correct size is 1 1/4 inch. Is that correct?? Thank you!
I am not sure what kind of bird you are asking about - barn swallows do not
nest in cavities and will not use nest boxes. Purple martins, which are
related and do nest in communal boxes, need a fairly large hole - I do not
have a guide in front of me, but I believe the holes in the boxes we use are
about 1 3/4" - I'm pretty sure 1 1/4 would be too small for martins.
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Update: June 2012