444 



ZOOLOGY 



their whalebone is, indeed, mereh^ a strainer to let the water 

 pass out of the mouth while the solid masses are retained. 



The order of hoofed mammals includes a large numljer of 

 animals, almost all of which are closely related and have never 

 more than four functional toes, excepting in the allied groups of 



Fig. 402. — Stone's Alaskan lilack sheep. Photo, of a group in the Field 

 Columbian Museum. 



elephants and certain small annuals allied to the " coney " of 

 Scripture, where there are tji^ically fi^'e. Of the true hoofed 

 mammals we distinguish the even-toed and the odtl-toed, which 

 we may consider further. 



The even-toed hoofed mammals include the hippopotamus 

 and other pigs and the peccaries, the camels and llamas, the 

 deer, the giraffes, and the antelopes, sheep (Fig. 402), and oxen. 



