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Updated: August 18, 2024
They meet a similar pair of teeth in the upper jaw, and give the hare, rabbit, rats, mice, beavers, and porcupines the power of "gnawing" tough substances. These animals are hence called Rodents, or gnawers, and the two great front teeth are called "rodent-teeth."
In this collection there are extinct species of all the thirty-two genera, excepting four, of the terrestrial quadrupeds now inhabiting the provinces in which the caves occur; and the extinct species are much more numerous than those now living: there are fossil ant-eaters, armadillos, tapirs, peccaries, guanacos, opossums, and numerous South American gnawers and monkeys, and other animals.
Perhaps you remember how different the front teeth of a rabbit are from those long, sharp ones which pussy shows now and then when she yawns. By constantly gnawing their food, the teeth of squirrels, hares, rats, mice, dormice, and all animals called Rodents, or Gnawers, would soon be worn away, but that, unlike our teeth, they never cease growing while the creature lives.
Of cetacea, or whale-like mammals, sixty-five; ruminantia, or cud-chewers, one hundred and seventy-seven; pachydermata, or thick-skinned mammals, such as the horse, hog, and elephant, forty-one; edentata, like the sloth and ant-eater, thirty-five; rodentia, or gnawers, such as the rat, squirrel, and beaver, six hundred and seventeen; carnivora, or flesh-eaters, four hundred and forty-six; cheiroptera, or bats, three hundred and twenty-eight; quadrumana, or monkeys, two hundred and twenty-one; and marsupialia, or pouched mammals, like the opossum and kangaroo, one hundred and thirty-seven.
The wolf and similar forms belong to the sub-family of dogs; while the lion, tiger, etc., belong to the sub-family of cats; The Rodentia, or Gnawers, comprising the rat, the hare, the beaver, the squirrel, the mouse, etc., etc.; The Insectivora, or Insect Feeders, comprising the mole, the shrew, the hedgehog, etc.;
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