. Animal studies. ADAPTATIONS 309 of water above their gills, by means of which they can breathe during short excursions from . the water. Still others (mud-fishes) retain the primitive lung-like structure of the swim-bladder, and are able to breathe air when, in the dry season, the water of the pools is reduced to mud. Another series of adaptations is concerned with the places chosen by animals for their homes. The fishes that live in water have special organs for breathing under water (Fig. 182). Many of the South American mon- keys have the tip of the tail adapted for clinging to limbs of t
. Animal studies. ADAPTATIONS 309 of water above their gills, by means of which they can breathe during short excursions from . the water. Still others (mud-fishes) retain the primitive lung-like structure of the swim-bladder, and are able to breathe air when, in the dry season, the water of the pools is reduced to mud. Another series of adaptations is concerned with the places chosen by animals for their homes. The fishes that live in water have special organs for breathing under water (Fig. 182). Many of the South American mon- keys have the tip of the tail adapted for clinging to limbs of trees or to the bodies of other monkeys of its own kind. The hooked claws of the bat hold on to rocks, the bricks of chimneys, or to the surface of hollow trees where the bat sleeps through the day. The tree-frogs (Fig. 183) or tree-toads have the tips of the toes swollen, forming little pads by which they cling to the bark of trees. Among other adaptations relat- ing to special surroundings or con- ditions of life are the great cheek J pouches of the pocket gophers, which carry off the soil dug up by the large shovel-like feet when the gopher excavates its burrow. „ , . Those insects which live under- Fig. 181.—Insect galls on leaf. ground, making burrows or tunnels in the soil, have their legs or other parts adapted for dig- ging and burrowing. The mole cricket (Fig. 184) has its legs stout and short, with broad, shovel-like feet. Some water-beetles (Fig. 185) and water-bugs have one or more of the pairs of legs flattened and broad to serve as oars or pad- dles for swimming. The grasshoppers or locusts, who 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 Jordan, David Starr, 1851-1931; Kellogg, Vernon L. [from old catalog].
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Keywords: ., bookauthorjordanda, bookcentury1900, bookdecade1900, bookyear1903
