. The economic value of birds to the state . near Philadelphia,*showed that the food of each individual averaged nearly two mice per day. Screech Owl (Megascops asio).— It has been shown that among our Hawkssome species feed so largely upon insects as to be classed among the insectivorousbirds, and so among our Owls we find that certain species subsist to a great extentupon insects. This will be evident on examination of the following summary ofthe food of our little Screech Owl: Summary of the Contents of 255 Stomachs of the Screech Owl. {From Fisher.) 1 stomach contained poultry. 38 stomachs
. The economic value of birds to the state . near Philadelphia,*showed that the food of each individual averaged nearly two mice per day. Screech Owl (Megascops asio).— It has been shown that among our Hawkssome species feed so largely upon insects as to be classed among the insectivorousbirds, and so among our Owls we find that certain species subsist to a great extentupon insects. This will be evident on examination of the following summary ofthe food of our little Screech Owl: Summary of the Contents of 255 Stomachs of the Screech Owl. {From Fisher.) 1 stomach contained poultry. 38 stomachs contained other birds. 91 stomachs contained mice. 11 stomachs contained other mammals. 2 stomachs contained lizards. 4 stomachs contained batrachians. 1 stomach contained stomachs contained insects. 5 stomachs contained stomachs contained crawfish. 7 stomachs contained miscellaneous matter. 2 stomachs contained scorpions. 2 stomachs contained earth stomachs were empty. * The American Naturalist, 1899, p. SCREECH OWLUpper figure, gray phase, lower figure, rufous phase of plumage ABOUT 3-6 NATURAL SIZE. ECONOMIC VALUE OF BIRDS TO THE STATE. 31 Great Horned Owl {Bubo virginianus).— While this large Owl feeds on bothpoultry and game birds it also preys upon mammals, some of which may beinjurious. As a rule, however, the bird is so uncommon near civilization, and soquickly disappears with the fall of the forests that its relations to man are at thebest indirect. Summary of the Contents of I2j Stomachs of the Great Horned Owl. (From Fisher.) 31 stomachs contained poultry or game birds. 8 stomachs contained other stomachs contained stomachs contained other mammals. 1 stomach contained a stomachs contained stomachs were empty. CUCKOOS. Family Cuculidas. Cuckoos, of which we have two species, the Yellow-billed and Black-billed, aregreat destroyers of caterpillars. In Farmers Bulletin No. 54 of the United Sta
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbirds, bookyear1903
