. Nature sketches in temperate America, a series of sketches and a popular account of insects, birds, and plants, treated from some aspects of their evolution and ecological relations . they had eaten ants, caterpillars, ground beetles, weevils,burrowing bugs, and grasshoppers, spiders, lulidse, and larvseof March flies. The habits of this bird suggest that the principaldrain on the number of predaceous beetles may be due to thedepredations of the migrants at the season of the greatestexposure to these insects; and that the complete destructionof resident birds would aSect the number of these
. Nature sketches in temperate America, a series of sketches and a popular account of insects, birds, and plants, treated from some aspects of their evolution and ecological relations . they had eaten ants, caterpillars, ground beetles, weevils,burrowing bugs, and grasshoppers, spiders, lulidse, and larvseof March flies. The habits of this bird suggest that the principaldrain on the number of predaceous beetles may be due to thedepredations of the migrants at the season of the greatestexposure to these insects; and that the complete destructionof resident birds would aSect the number of these carnivorousinsects much less than would at first seem likely. After reviewing this array of insect foj^d consumed by onespecies of bird, it is readily conceived what a pronounced effectthe combined action of many species would have in controllingthe number of insects. Especially is this factor of insectcontrol an important one in the spring, when it is rememberedthat many of these hibernating insects are the sole survivorsof many that have perished through the cold winter. Other birds have been studied in relation to their food supply GENERAL OBSERVATIONS AND SKETCHES AFIELD 313. The Hermit Thrush, a mifjrant in this region. Its food supplyconsists of a great varictij of inserts, and on this accountit is an important biological factor. 314 NATURE SKETCHES IN TEMPERiSTE AMERICA by Forbes. Those especially interested in this subject willalso find much of great value in the researches carried on bythe staff of the Department of Agriculture at Washington,concerning the hawks and owls by Fisher, the woodpeckers,the meadow lark, and the Baltimore oriole by Baal, and thecommon crow by Barrows and Schwarz.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbirds, booksubjectins
