. Animal studies. 204 ANIMAL STUDIES carnivorous, and usually very voracious. The lizards espe- cially devour large quantities of insects and snails, together with small fishes and frogs. The latter figure largely in the turtle's bill of fare, and in that of the snakes, which also capture birds and mammals. On the other hand, many of the reptiles prey upon one another; and they are the favorite food of hawks and owls and numerous water-birds, of skunks and weasels and many other animals, which look for them continually. Many of the turtles, owing to their protective armor, and the snakes becau
. Animal studies. 204 ANIMAL STUDIES carnivorous, and usually very voracious. The lizards espe- cially devour large quantities of insects and snails, together with small fishes and frogs. The latter figure largely in the turtle's bill of fare, and in that of the snakes, which also capture birds and mammals. On the other hand, many of the reptiles prey upon one another; and they are the favorite food of hawks and owls and numerous water-birds, of skunks and weasels and many other animals, which look for them continually. Many of the turtles, owing to their protective armor, and the snakes because of their poison- ous bite or great size and strength, are more or less ex- empt, but this is not true of their eggs and young. The smaller species depend upon keenness of sense, agility, and inconspicuous tints. These latter may undergo changes according to the character of the surroundings, but usually only to a slight extent. The chameleons of the tropics and a similarly colored green lizard on the pine-trees in the Southern States are able to change with great rapidity from green, through various shades, to brown. 191. Respiration and circulation.—While still in the egg the young lizard develops rudimentary gills, and thus bears nam extnax intm e^^%J^J^lmdMM Fig. 119.— Dissection of lizard (Scelopoms). an., anal opening ; auricle ; , brain ; coec, intestine ; kd., kidney ; Ling., left lung ; lr., liver ; pn., pancreas; , spinal cord ; spl., spleen ; St., stomach ; v., ventricle of heart. evidence to the fact that its distant ancestors were aquatic; but before hatching they disappear, and lungs arise, which. 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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