442 



ZOOLOGY 



The armadillos are protected by strong plates developed in 

 the sldn ; they are cliiefl^y nocturnal and omnivorous animals, 

 and burrow rapiiU}'. The other three families feed on ants and 



Fig. 400. — T«-.. -toed sl.ith, rholaniu.-^. .Vfter Vu}j:t an.l Spofht. 



termites, usually lack complete teeth, and either live in trees 

 or l.)nrr()\v in the ground. 



The whales and allies (Cetacea ^) ha\'e taken to an acjuatic 

 life, for it is certain that their ancestors were land animals. 

 The sea-cows (manatees -), found in rivers in various parts of 



' ci'tus, whale. - From a native name. 



