THE CLASSIFICATION OF ANIMALS 527 



Order 4 CETACEA. Adapted to marine life. Whale, por- 

 poise, dolphins. 



Order 5 SIRENIA. Fishlike in form ; pectoral limbs 

 paddle-like. Examples : manatee, dugong, sea cow. 



Order 6 RODENTIA. Incisor teeth chisel-shaped, usually 

 two above and two below. Examples : beaver, rat, porcu- 

 pine, rabbit, squirrel. 



Order 7 UNGULATA. Hoofs ; teeth adapted for grinding. 



a. Odd-toe. Horses, zebras, rhinoceros. 



b. Even-toe. Ox, sheep, antelope, camel, giraffe, deer, 



pig, hippopotamus. 



c. Proboscidea. Elephants. 



Order 8 INSECTIVORA. Small, insect-eating, furry or 

 spiny covered ; long snout. Moles, shrews, hedgehog. 



Order 9 CHIROPTERA. Fore limbs adapted to flight, 

 teeth pointed. Example : bat. 



Order 10 CARNIVORA. Long canine teeth, sharp and 

 long claws. Examples : dog, cat, lion, bear, seal, and sea lion. 



Order 11 PRIMATES. This order of animals includes man. 

 Erect or nearly so, fore appendages provided with a hand. 

 Lemurs, monkeys, baboons, mandrills, apes, gibbons, orang- 

 utans, chimpanzees, gorillas are in this group. 



a. Lemuroidea. Small squirrel-like animals living in trees 



and bushes. The lemurs and marmosets. 



b. Cebidae. The New World monkeys. Grasping tails and 



flat noses. Howling monkey, spider monkey, capuchin. 



c. Cercopithecidae. The Old World monkey. Tail not 



grasping, or short ; nostrils pointing downward. Dis- 

 tinct, opposable thumb. Baboon, mandrill. 



d. Simiidae. The anthropoid (man-like) apes. No dis- 



tinct tail; arms longer than legs. Gibbon, orang- 

 utan, chimpanzee, and gorilla. 



e. Hominidae. The human race. 



