boundaries described, these birds wander from their chosenbreeding grounds to and from their winter retreats under thetropical sun. During this semi-annual migration, individuals maybe attracted to suitable boxes put up for their use in sections ofthe country where they are not now encouraged.… … howing At my own premises where my colonies of breeding Martins 1902 have numbered over eighty pairs, the four houses are mantained Thousands of Jacobs Martin Houses are now in use in the states east of the Rocky Mountains, in Canada and in Europe. SiFl# ® 4® R®#iits
Birdhouses
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