. Elementary zoology. Zoology. 296 ELEMENTARY ZOOLOGY and the gills disappear (except in the cases of the few forms which retain gills through life). The tail shortens and finally disappears in the frogs and toads; with the salaman- ders the tail-fin only is lost. At the same time the change from water to land is made. Further growth is very. Fig. 120.—Tadpoles. (Photograph from life by Cherry Kearton; per- mission of Cassel & Co.) slow; frogs are not really adult, that is, capable of pro- ducing young, until they are five years old, and they may continue to increase in size until they are
. Elementary zoology. Zoology. 296 ELEMENTARY ZOOLOGY and the gills disappear (except in the cases of the few forms which retain gills through life). The tail shortens and finally disappears in the frogs and toads; with the salaman- ders the tail-fin only is lost. At the same time the change from water to land is made. Further growth is very. Fig. 120.—Tadpoles. (Photograph from life by Cherry Kearton; per- mission of Cassel & Co.) slow; frogs are not really adult, that is, capable of pro- ducing young, until they are five years old, and they may continue to increase in size until they are ten years old. The food of the adult batrachians is almost exclusively small animals, particularly insects and worms. Crus- taceans, snails, and young fish are also eaten. The tad- poles also eat vegetable matter. Almost all batrachians are nocturnal in habit, remaining concealed by day. In the zones in which cold winters occur they hibernate or pass the winter in a torpid condition, or state of "sus- pended animation," or, as it is said, they sleep through the winter. Frogs burrow into the mud at the bottom of ponds at the approach of winter and come forth early in. 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. New York : H. Holt and company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
