. Circular. Agriculture. 9?////A â 'yyyyyy-- may get the box too high or too low; but all these things make very little difference. The situation, environment, and size of the entrances, however, are important. I have known tree swallows to nest in a round box 3| inches in interior diam- eter, in a flowerpot even smaller at the bottom, and in a one- apartment bird house, nearly a foot square and about 18 inches high from floor to ridgepole (Fig. 10). This is one of the most popular houses with tree swallows. But why waste enough lumber on one bird house to make three nesting boxes? I have trie
. Circular. Agriculture. 9?////A â 'yyyyyy-- may get the box too high or too low; but all these things make very little difference. The situation, environment, and size of the entrances, however, are important. I have known tree swallows to nest in a round box 3| inches in interior diam- eter, in a flowerpot even smaller at the bottom, and in a one- apartment bird house, nearly a foot square and about 18 inches high from floor to ridgepole (Fig. 10). This is one of the most popular houses with tree swallows. But why waste enough lumber on one bird house to make three nesting boxes? I have tried facing the entrance hole to all points of the com- pass. The birds used them all. Painted or unpainted, weath- ered or unweathered, wood, bark, cement, tin, clay, papier mache and roofing felt, â all have been chosen indiscriminately by feathered house hunters. Boxes placed 6 feet from the ground and others set on poles on the roofs of tall city build- ings have been taken. I have seen chickadees nesting in a hole in a birch stump 2 feet from the ground and in the hollow branch of an elm 65 feet up. One wood duck settled in a hollow apple tree 3 feet from the ground, and another 40 feet up in a hollow elm. Such experiences lead us to revise our opinions regarding the exact size of the tenement each bird requires and how high or low it should be situated. I am not so positive as I once was regarding what is best for certain species or what kind of a box or situation will best please each one. It seems that the birds have some individuality, or that they need nesting places so badly that they will take almost anything Fig. 9. â Box inside a building. (From Biological Survey.). Fig. 10. â Swallow Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Massachusetts. State Board of Agriculture. Boston, Mas
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