. Animal biology. Zoology; Biology. Ear opening Fig. 276.—Heads of a bull snake, Pituophis sayi (Schlegel), and of a lizard, Plestiodon septentrionalis 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. tongue, which is club-shaped and abundantly provided with a sticky secretion, can be protruded to a distance of six inches or more. This enables the chemeleon to use its tongue for capturing insects, which constitute its entire diet. Cha- meleons are generally oviparous, although a few produce living young.
. Animal biology. Zoology; Biology. Ear opening Fig. 276.—Heads of a bull snake, Pituophis sayi (Schlegel), and of a lizard, Plestiodon septentrionalis 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. tongue, which is club-shaped and abundantly provided with a sticky secretion, can be protruded to a distance of six inches or more. This enables the chemeleon to use its tongue for capturing insects, which constitute its entire diet. Cha- meleons are generally oviparous, although a few produce living young. They are famed for their power of changing color, which is due to the presence of chromatophores in the skin, affected both by outside stimuli and by stimulation by the nervous system. 417. Lizards.—The lizards are the most typical of the reptiles. The limbs are well-developed and modified for running, climbing, or digging. Rarely limbs are absent, in which case the animal has very much the appearance of a snake. This is true of the so-called glass snakes of Europe and America, which are really lizards, and of some bur- rowing lizards, known as worm lizards, found in southern United States. Legless lizards may be distinguished from snakes (Fig. 276) by the. Fig. 277.—Wall gecko, Tarentola mauritanicus (Linnaeus), of southern Europe. {From Brehm, " ;) 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; University of Nebraska (Lincoln campus). Dept. of Zoology. New York ; London : McGraw-Hill Book Company, Inc.
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