. Adventures with animals and plants. Biology. PROBLEM I. The Kinds of Annuals of the Earth 3T. Fig. 42 A green frog can jinnp fifty times its P'lc. 43 The American toad cannot jump as far length. What structures make this possible}' as the frog. Can you tell why}' (Schneider and (AMERICAN MUSEUM OF NATURAL HISTORY) SCHWARTZ) part on land. While in the water stage thev obtain air by means of gills; in the land stage they use lungs for breathing. There are a few species which do not develop lungs at any stage and never leave the water; when full grown they resemble a legged tadpole. Amphibians
. Adventures with animals and plants. Biology. PROBLEM I. The Kinds of Annuals of the Earth 3T. Fig. 42 A green frog can jinnp fifty times its P'lc. 43 The American toad cannot jump as far length. What structures make this possible}' as the frog. Can you tell why}' (Schneider and (AMERICAN MUSEUM OF NATURAL HISTORY) SCHWARTZ) part on land. While in the water stage thev obtain air by means of gills; in the land stage they use lungs for breathing. There are a few species which do not develop lungs at any stage and never leave the water; when full grown they resemble a legged tadpole. Amphibians with tails. Biologists divide the class Amphibians into two orders — those with tails and those without. The tailed forms, the salamanders and newts, might be mistaken for lizards until one discovers the moist, naked skin. They are timid, harmless creatures; their feet have no claws and their jaws are weak, unfitted for biting. They catch insects with the tongue. Some of the tailed am- phibians are brightly colored; others, like the hellbender, are dull and un- attractive. One that many of you may have found in the woods, under logs or leaves, is the beautiful red newt. Amphibians without tails. You are much more familiar with this group which includes the frosts and toads. Thev feed on insects which they catch with their long, slimy tongue. They lay their eggs in fresh water; these hatch into tadpoles which change into adults as legs and lungs form. Frogs when fully developed, continue to spend at least part of their time resting just under the sur- face of the water with eyes and nostrils raised above the surface. The hind feet are webbed and are equally useful for swimming and jumping. Toads, on the other hand, leave the pond and return only in the spring to lay their eggs. Their skin becomes so dry that it looks shriveled and warty. The statement that you can get warts from handling toads was long ago proved to be untrue. Toads are not only harmless to us but are a great
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Keywords: ., bookcentury1900, bookpublisherbostondcheath, booksubjectbiology
