. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. REPTILES 287. Box tortoise (Terrapin). From photograph loaned by the American Museum of Natural History. thickness. Many of the sea-water turtles are of large size, the leatherback and the green turtle often weighing six hundred to seven hundred pounds each. The flesh of the green turtle and especially the diamond- back terrapin, an animal found in the salt marshes* along our southeastern coast, are highly esteemed as food. Unfortunately for the preservation of the species, these animals ar
. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. REPTILES 287. Box tortoise (Terrapin). From photograph loaned by the American Museum of Natural History. thickness. Many of the sea-water turtles are of large size, the leatherback and the green turtle often weighing six hundred to seven hundred pounds each. The flesh of the green turtle and especially the diamond- back terrapin, an animal found in the salt marshes* along our southeastern coast, are highly esteemed as food. Unfortunately for the preservation of the species, these animals are usually taken during the breeding season, when they go to sandy beaches to lay their eggs. Characteristics of the Reptilia. — The turtle belongs to the class of vertebrates known as the Reptilia. These animals are charac- terized by having scales developed from the skin. These in the turtle have become bony and are connected with the internal skeleton. Turtles always breathe by means of lungs, differing in this respect from the amphibians. They seem to show their dis- tant relationship to birds in that their eggs are large and are encased in a leathery, limy shell. Lizards. — Lizards may be recognized by the long body with four legs of nearly equal size. The body is covered with scales. The animal never lives in water, it is active in habit, and it does not undergo a metamorphosis. Salamanders (commonly called lizards) have a moist skin, and belong to the Amphibia. Lizards are harm- less creatures, the Gila monster of New Mexico and Arizona, a poisonous variety, being the one exception. Lizards are, on the whole, of economic importance to man because they eat insects and include the injurious ones in their dietary. Certain lizards, including injurious ones, notably the chameleon and our common fence lizard, have the power to change the color of the skm. This forms a protective adaptation, for they thus assume the color of their immediate surroundings. The horned toad of o
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