. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. BIRDS 287 the relative importance, numerically, of these various cate- gories among the birds which may be found in a certain region, and thus form its bird-fauna, we may illustrate by reference to a definite region. Of the 351 species of birds which have been found in the state of Kansas (a region without distinct natural boundaries, and fairly representative of any Mississippi valley region of similar extent), 51 are all-year residents, 125 are summer residents, 36 are winter residents, 104 are migrants, and 35
. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. BIRDS 287 the relative importance, numerically, of these various cate- gories among the birds which may be found in a certain region, and thus form its bird-fauna, we may illustrate by reference to a definite region. Of the 351 species of birds which have been found in the state of Kansas (a region without distinct natural boundaries, and fairly representative of any Mississippi valley region of similar extent), 51 are all-year residents, 125 are summer residents, 36 are winter residents, 104 are migrants, and 35 are rare •\ FIG. 131.—Nest of song sparrow (Melospiza cinercd). (Photograph by J. H. Paine) The all-year residents and the summer residents, comprising about one-half of the species to be found in a locality, are the only ones which breed there, and which thus present oppor- tunity for observations on their nest-building habits and care of the young. Numerous suggestive questions present them- selves in connection with breeding. Why is it that some species nest early and some late? Can the character of the food of the young have anything to do with this? If so, what? Does the condition of the particular trees, bushes or other favorite sites for nests help determine the nesting time? Why. 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 Kellogg, Vernon L. (Vernon Lyman), 1867-1937; Doane, Rennie Wilbur, 1871-. New York, H. Holt and company
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