Yosemite nature notes . / /nch roots deep within the jaws. The caninesare lacking but there are competent jawteeth for the grinding up of food cutby the incisors. The rodent skull figured is from themountain beaver or Aplodontia (see ). If one is accustomed to thinkingof rodents as being only small creatures,such as rats and mice, it should be re-membered that the golden beaver (Cas-tor canadensis, subauratus) attains aweight in the neighborhood of 40 pounds,yet is very definitely a rodent!. A\ule Deer $Hi>3z Cony y*NH *I33 o Z 3 ^36 Rabbits, hares and conies (Lagomor-pha) outwardly res
Yosemite nature notes . / /nch roots deep within the jaws. The caninesare lacking but there are competent jawteeth for the grinding up of food cutby the incisors. The rodent skull figured is from themountain beaver or Aplodontia (see ). If one is accustomed to thinkingof rodents as being only small creatures,such as rats and mice, it should be re-membered that the golden beaver (Cas-tor canadensis, subauratus) attains aweight in the neighborhood of 40 pounds,yet is very definitely a rodent!. A\ule Deer $Hi>3z Cony y*NH *I33 o Z 3 ^36 Rabbits, hares and conies (Lagomor-pha) outwardly resemble the rodents inmany respects. The front teeth growcontinually to compensate for wear, butthe enamel exends to the back surfaceof the tooth. There is also an extra pairof incisors, lacking the cutting edges,right behind the upper, front, two chiselteeth. The jaws of lagomorphs are so fas-tened that they chew with a sidewise mo-tion, while in rodents there is consider-able longitudinal action. A good name for the hoofed mammalsmight be toenail walkers, for the hoofis actually a specialized toenail. Yosemitedeer and bighorns, or mountain sheep,usually walk on the two large toenailson each foot and are therefore membersof the tven-toed, hoofed order of mam-mals, Artiodactyla. 56 YOSEMITE NATURE NOTES
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectnatural, bookyear1922
