. Animal biology. Zoology; Biology. Ear opening Fig. 261.—Heads of a bull snake, Pituophis sayi (Schlegel), and of a lizard, Plestiudun septcntrionalis Baird. A, head of the snake, from the side; B, from below. C, head of the lizard, from the side; D, from below. A and B, X %; C and D, X 2. burrowing lizards, known as worm lizards, found in southern United States. Legless lizards may be distinguished from snakes (Fig. 261) by the presence of movable eyelids and an external ear opening, both of which snakes lack, and by having small over- lapping scales on the ventral side of the body instead o
. Animal biology. Zoology; Biology. Ear opening Fig. 261.—Heads of a bull snake, Pituophis sayi (Schlegel), and of a lizard, Plestiudun septcntrionalis Baird. A, head of the snake, from the side; B, from below. C, head of the lizard, from the side; D, from below. A and B, X %; C and D, X 2. burrowing lizards, known as worm lizards, found in southern United States. Legless lizards may be distinguished from snakes (Fig. 261) by the presence of movable eyelids and an external ear opening, both of which snakes lack, and by having small over- lapping scales on the ventral side of the body instead of the transverse scutes which snakes possess. The tails of lizards are generally long, easily broken off or separated into pieces, and with equal ease more or less com- pletely regenerated, though the re- generated appendage does not possess vertebrae. Lizards are in most cases oviparous and the eggs are protected by a thin shell with Uttle Ume in it. They feed largely on insects, worms, and other small animals and some are to a considerable degree vegetable feeders. Geckos (Fig. 262) are Hzards which inhabit all warmer regions, are noc- turnal, and have toes fitted for climb- ing, thus enabling them to run over trees and rocks and even over the walls and ceilings of buildings. The flying dragon, found in southeastern Asia and the East Indies, has. Fig. 262.—Wall gecko, Tarcntola mauritanicus (Linnaeus), of southern Europe. {From Brehm, " ;) ,3- X 2^. 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 Wolcott, Robert Henry, 1868-1934. New York ; London : McGraw-Hill Book Company, Inc.
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