. Bulletin - Biological Survey. Zoology, Economic. from monopolizing by shooting or Pig. 2.—A simple martii the martin boxes. This may be accomplished poisoning the sparrows, by closing the entrances to the nesting- boxes during the winter, or by taking the boxes down until the arrival of the mar- tins in spring. CULTURAL METHODS. Investigation of the habits of birds dur- ing the winter months has shown that cer- tain species, notably Brewer blackbirds, bronzed grackles, great-tailed grackles, kill- deer, and upland plover, are quickly at- tracted to fields where plowing or harrow- ing is goin
. Bulletin - Biological Survey. Zoology, Economic. from monopolizing by shooting or Pig. 2.—A simple martii the martin boxes. This may be accomplished poisoning the sparrows, by closing the entrances to the nesting- boxes during the winter, or by taking the boxes down until the arrival of the mar- tins in spring. CULTURAL METHODS. Investigation of the habits of birds dur- ing the winter months has shown that cer- tain species, notably Brewer blackbirds, bronzed grackles, great-tailed grackles, kill- deer, and upland plover, are quickly at- tracted to fields where plowing or harrow- ing is going on, and usually when these birds have been shot while following the plow, boll weevils have been found in their stomachs. This is particularly true in fields where the ground is being newly broken or the old cotton stalks first broken down. In view of the pronounced habit on the part of many birds of feeding in culti- vated fields, the following suggestions are believed to be worthy of adoption: 1. Break the ground as early in the win- ter as practicable, at a time when blackbirds are numerous. If after the first plowing the ground is still rough, or if there is any rubbish. n 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 United States. Bureau of Biological Survey. Washington : Govt. print. off.
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