. Bulletin. Animals -- United States; Birds -- United States. BARN SWALLOW. 13 of accuracy the number of cliff swallows in the State of Texas during the month of September, but a very conservative estimate of the number passing- over the town of Victoria each day of the migration is Allowing but one meal a day and assuming that each bird consumed on an average 18 weevils per day for the period of six days during which the flight was under observation, we find that these swallows destroy in one week in a single county more than a million weevils! And this vast number is destroyed withou
. Bulletin. Animals -- United States; Birds -- United States. BARN SWALLOW. 13 of accuracy the number of cliff swallows in the State of Texas during the month of September, but a very conservative estimate of the number passing- over the town of Victoria each day of the migration is Allowing but one meal a day and assuming that each bird consumed on an average 18 weevils per day for the period of six days during which the flight was under observation, we find that these swallows destroy in one week in a single county more than a million weevils! And this vast number is destroyed without a dol- lar's expense to the cotton grower. In view of this good service the. Fig. 4.—Barn swallow. folly of destroying the nests of swallows and of shooting the birds l)ecause they harbor insects is apparent, especially Avhen it is remem- bered, as stated above, that the swallow ]:>arasites are not to be feared hy man. Barn swallow.—Barn swallows are connnon sunnner residents in the western portion of Texas, but for some unknown reason do not breed in the eastern part of the State. Even there they are common, however, in the fall, when they join the other swallows in coursing over the cotton fields. They fly very swiftly, often just above the tops of the plants, and many a boll weevil falls a prey to their per-. 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 : G. P. O.
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