. Yearbook of the United States Department of Agriculture 1900 . paratively little muscular development, and can not assimilateanything but the softest, most readily digestible material. Thereforein the case of many species the food of the young must differ radi-cally from that of the adult. Such grain-eating birds as pigeons, pos-sessed of strong gizzards, feed their squabs on the so-called pigeonsmilk, which is digested grain of semifluid consistency, disgorged bythe parent bird into the gullet of its offspring. Many birds that arelargely vegetarians, but not endowed with this power of regur
. Yearbook of the United States Department of Agriculture 1900 . paratively little muscular development, and can not assimilateanything but the softest, most readily digestible material. Thereforein the case of many species the food of the young must differ radi-cally from that of the adult. Such grain-eating birds as pigeons, pos-sessed of strong gizzards, feed their squabs on the so-called pigeonsmilk, which is digested grain of semifluid consistency, disgorged bythe parent bird into the gullet of its offspring. Many birds that arelargely vegetarians, but not endowed with this power of regurgitatingdigested food, rear their young for a time on insects. The crow black-bird, whose annual food is three-fourths vegetable matter, will serveas an illustration: The first meal of the nestlings often consists ofplump spiders of soft texture, which suit the delicate embryonicstomach; and these, together with tiny young grasshopper nymphsand soft small cutworms, continue for a while to form the food. As Yearbook U. S. Dept. of Agriculture. 1900. Plate Nest with Grasshopper in Fig. 1.—Bluebird at Edg Mouth. [From photograph by Rev. P. B. Peabody.]
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectweather, bookyear1901
