. Elementary biology, animal and human. Biology. BIRDS 89 do much harm by the distribution of seeds of poison ivy, poison sumach, and perhaps other noxious plants. (6) They do much harm by the destruction of beneficial insects. On the other hand: (1) They do much good by the destruction of injurious insects. (2) They are largely beneficial through their destruction of mice and other, rodents. (3) They are valuable occasionally as ; — W. B. Babkows, " The Food of ;. Fig. 74.—The crow. While most of the hawks are undoubtedly beneficial (69), two species, namely. C
. Elementary biology, animal and human. Biology. BIRDS 89 do much harm by the distribution of seeds of poison ivy, poison sumach, and perhaps other noxious plants. (6) They do much harm by the destruction of beneficial insects. On the other hand: (1) They do much good by the destruction of injurious insects. (2) They are largely beneficial through their destruction of mice and other, rodents. (3) They are valuable occasionally as ; — W. B. Babkows, " The Food of ;. Fig. 74.—The crow. While most of the hawks are undoubtedly beneficial (69), two species, namely. Cooper's hawk and the sharp-shinned hawk, must be kept down to limited numbers. Both of these are " chicken-hawks," and in addition they ruthlessly destroy great numbers of our most valuable wild birds. 72. Summary of the relation of birds to human welfare. — Library study. ^ For further facts like the following, consult. Weed and Dear-. 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 Peabody, James Edward, b. 1869; Hunt, Arthur Ellsworth, joint author. New York, The Macmillan company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbiology, bookyear1912
