. Useful birds and their protection. Containing brief descriptions of the more common and useful species of Massachusetts, with accounts of their food habits, and a chapter on the means of attracting and protecting birds . Fig. 39.—The yellow bear caterpillar. This andthe woolly bear are destructive hairy species, suchas are eaten by Thrushes, Robins, and Bluebirds. BIRDS, CATERPILLARS, AND PLANT LKJE. 121. Fig. 40.— Caterpillar of the white-marked tussockmoth, a destructive shade-tree pest, eaten by manyliirds. country from injury by these insects is largely due to thegood work of native bird
. Useful birds and their protection. Containing brief descriptions of the more common and useful species of Massachusetts, with accounts of their food habits, and a chapter on the means of attracting and protecting birds . Fig. 39.—The yellow bear caterpillar. This andthe woolly bear are destructive hairy species, suchas are eaten by Thrushes, Robins, and Bluebirds. BIRDS, CATERPILLARS, AND PLANT LKJE. 121. Fig. 40.— Caterpillar of the white-marked tussockmoth, a destructive shade-tree pest, eaten by manyliirds. country from injury by these insects is largely due to thegood work of native birds, while the greater destructiyenessof this insect in our cities is no doubt in consequence of thescarcity of such l)irds there. Regarding the immunity t)f brightly colored caterpillarsfrom destruction ])y birds, my eyidence is mainlj^ of a nega-tive character, andtherefore of littlevalue. I have neverknown birds to catcertain of the mostgaudily colored cater-pillars, while othersare commonly eatenby them. It Avouldseem that such larxa?as are made conspicuous by their coloring must have somemeans of protection against their enemies. In some instancesthese bright colors may serve to warn birds that the creaturedisplaying them is distasteful or unfit for food. Usually,however, such caterpillars are not numerous, and must, there-fore, be preyed upon by natural enemies. In that most admirable local ec
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbirds, bookyear1913
