. A textbook in general zoology. Zoology. 24i PROGS, TOADS, AND SALAMANDERS passed on land. Since the earl}', or larval stage, of these animals is } in the water, most of the larva' are furnislied with gills for breathing. Adult amphibians that hve in the water all their lives retain the gills throughout life. Those, ho\\'ever, that live on lantl during the adult stage lose the gills, an( 1 have lungs instead. They differ from the fishes in having seg- mented Umbs instead of fins. The}' are cold blooded. The majorityhave smooth, scaleless skins. Adaptations to en- vironment. â Note that
. A textbook in general zoology. Zoology. 24i PROGS, TOADS, AND SALAMANDERS passed on land. Since the earl}', or larval stage, of these animals is } in the water, most of the larva' are furnislied with gills for breathing. Adult amphibians that hve in the water all their lives retain the gills throughout life. Those, ho\\'ever, that live on lantl during the adult stage lose the gills, an( 1 have lungs instead. They differ from the fishes in having seg- mented Umbs instead of fins. The}' are cold blooded. The majorityhave smooth, scaleless skins. Adaptations to en- vironment. â Note that the tadpoles of amphibians wliich live in the water have gills to suit such an land is substituted for water, Again, the necturus. Fig. 4H ' â Tree toad on the bark of a tree environment; but when dry the gills are lost and lungs appear, and the siren that live in the water all their lives retain the gills throughout life, as best suited to such an emdronment. Tadpoles of frogs and toads are providetl with broad, flat tails for swimming; but the adult frogs and toads are tailless. Many frogs are excellent swimmers, however, because of their webbed toes and the adaptations of their legs to such a purpose. The webbed toes of some species of the tree frogs of the Malaysian Islands (Fig. 170) have become much enlarged and adapted to quite a different. 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 Herrick, Glenn W. (Glenn Washington), 1870-1965. New York, Cincinnati [etc. ] American Book Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
