GROUP OF RODENT ANIMALS 
RODENTS. 
THE RopENTS, or gnawing animals, derive their name from the peculiar structure of 
their teeth, which are specially fitted for gnawing their way through hard substances. 
The jaws of the Rodents are heavily made, and very large in proportion to the head, 
their size being not only needful for the support of the gnawing teeth, but for their 
