MAMMALIA. 



303 



thrust in their head. Advantage is taken of this predilec- 

 tion to entrap the animal, the natives of the Eocky Moun- 

 tains often baiting Bear traps with honey, 



The Seals and Walrus (fig. 69) form the next, or Phocine 

 tribe ; they are amphibious, and feed chiefly on Eish, inhabit- 

 ing the colder regions of the North ; their hinder extremities 

 are but little developed, and serve the purposes of a tail. 

 They are covered with a close fur, and the canine teeth of 

 the Walrus is so largely developed in the upper jaw as to 

 form tusks, by means of which they hook on and attach 

 themselves to the blocks of ice. 



FIG. 69. WALEUS (Trichicus rosmarus) ; SEAL (Phoca vitulina). 



9. The IKSECTIVORA, such as the Mole, Hedgehog, and 

 Shrew-mouse, (fig. 70), live entirely on insects, the Mole bur- 

 rows for them in the earth, and the fore paws are so made as 



