. Elements of comparative zoology. Zoology. 374 SYSTEMATIC ZOOLOGY. receives interest from the fact that it was first described by Thomas Jefferson. The ant-eaters are true edentates in that they are wholly without teeth. As their name implies, ants form the chief part of their food; their claws are well adapted for digging into the nests, the tongue is very long and extensible, while the salivary glands pour out a thick, sticky secretion which fastens the ants to the tongue. The true ant-eaters are natives of South America, but in Africa and India are allied forms with teeth, which also feed
. Elements of comparative zoology. Zoology. 374 SYSTEMATIC ZOOLOGY. receives interest from the fact that it was first described by Thomas Jefferson. The ant-eaters are true edentates in that they are wholly without teeth. As their name implies, ants form the chief part of their food; their claws are well adapted for digging into the nests, the tongue is very long and extensible, while the salivary glands pour out a thick, sticky secretion which fastens the ants to the tongue. The true ant-eaters are natives of South America, but in Africa and India are allied forms with teeth, which also feed upon ants. Among these are the pangolins (fig. 163) in which the whole upper surface of the body is covered with scales, arranged somewhat like those of a pine-cone. These scales, as already mentioned (p. 364), are to be regarded as modified hair. Order III.—Rodentia (The Gnawers). The rodents are the gnawers, the well-known abilities of rats, mice, and beavers in this direction being shared by all members of the order. They have no canine teeth;. Fig. 164.—Skull of muskrat (enlarged), showing the gnawing incisors and absence of canines. the molars are usually f, while the incisors vary between |, |, and f. These incisors demand a moment's attention. These teeth have persistent pulps, , they continue to grow throughout life. As fast as they wear away they. 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 Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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