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Tree Swallow travel in the Northern US and Canada. My husband loves watching these swallows swoop directly in and out of the several houses we have on our property. We do have trouble between the Tree Swallows and the Bluebirds. They like their houses in the same sort of open area on a post and they take the same size hole of 1 1/2 inch. These houses need to be put over 50 foot apart from each other or trouble will brew. Although they take the same size hole, the Tree Swallow has a very long straight tail and is much more comfortable in a longer house. The specs call for a 5 inch to 8 inch length in a Tree Swallow House giving lots of room for their tails so their heads don’t stick out the hole while they are nesting. The width should be at least 4 inches and inside height of 6 inches. They should be mounted on a post facing an open field. They eat mosquitos and insects so near a source of water is nice but not necessary.
