Zöology; a textbook for colleges and universities . - Photograph by E. R. Sanborn, N. Y. Zoo/. Soc. FIG. 181. Branick paca (Dinomys branicki); a rare rodent from Peru,long known only from a single Photograph by E. R. Sanborn, N. Y. Zool. 182. American beaver (Castor canadensis). MAMMALS 407 are of course not pigs, and they do not comefrom Guinea ; the original intention was to sayGuiana pig. They constitute a peculiarSouth American genus, and should be knownas cavies (Cavia). The Norway rat and housemouse are of Old World origin, and have beenintroduced into America by man.
Zöology; a textbook for colleges and universities . - Photograph by E. R. Sanborn, N. Y. Zoo/. Soc. FIG. 181. Branick paca (Dinomys branicki); a rare rodent from Peru,long known only from a single Photograph by E. R. Sanborn, N. Y. Zool. 182. American beaver (Castor canadensis). MAMMALS 407 are of course not pigs, and they do not comefrom Guinea ; the original intention was to sayGuiana pig. They constitute a peculiarSouth American genus, and should be knownas cavies (Cavia). The Norway rat and housemouse are of Old World origin, and have beenintroduced into America by man. The nativeAmerican rats and mice belong to differentgenera, although the genera Castor (beavers),Marmota (marmots and woodchucks), Sciurus(squirrels), and some genera of voles are com-mon to the New and Old Worlds. The prairiedog (Cynomys, meaning dog mouse) ispeculiar to North America; it is essentially asquirrel modified for life on the treeless rabbits, hares, and pikas are usuallyplaced with the rodents, from which they differby having two pairs of incisor teeth in the upperjaw. Anatomical evidence has lately beenpresented, which seems to show that these ani-mals constitute a group di
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1920
