Quote:
Originally Posted by alacringa
The ones that were flying around your garage at the test were Barn Swallows. Cliff Swallows usually use a rock, brick, or concrete surface; and neither nests in cavities (like nest boxes). Your nest boxes will work for Tree Swallows provided the hole is big enough (usually 1 1/2") and the floor area is big enough (typically 5"x5").
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Is that the correct size hole for swallows? In my youth I built a few houses with 1 1/2 inch holes and only got sparrows. It was a long time back, but I recall being told that swallows favored a smaller entrance, where they could enter and larger birds could not.