APPENDIX 799 



keys, hawks, eagles, vultures, pigeons, parrots, owls, hummingbirds, 

 and all the perching birds such as sparrows and thrushes. 

 Class Mammalia. Mammals. The only animals that have true hair. 



Subclass Prototheria. Egg-laying mammals, monotremes, duckbilled 

 platypus, spiny anteater. 



Subclass Metatheria. Pouched mammals, marsupials. Kangaroo, 

 opossum, and others, nearly all of them native to Australia. 

 Subclass Eutheria. Placental mammals. Young developed in the 

 body of the mother and attached to the uterus by a placenta. 



Order Xenarthra. Armadillo, sloth. 



Order Insectivora. Moles, shrews, hedgehogs. 



Order Chiroptera. Bats. 



Order Lagomorpha. Pikas, hares, rabbits. 



Order Rodentia. Squirrels, rats, mice, beavers, gophers, etc. 



Order Proboscidea. Elephants. 



Order Hyracoidea. True coneys of Syria and Africa, e.g., Hyrax. 



Superficially resemble guinea pigs but related to hoofed animals. 



Order Perissodactyla. Odd-toed hoofed mammals. Horses, zebras, 



rhinoceros, tapir. 



Order Artiodactyla. Even-toed hoofed mammals. Pigs, hippo- 

 potamus, deer, giraffe, sheep, cattle, etc. 



Order Cetacea. Whales, dolphins, porpoises. 



Order Sirenia. Sea cows. Large plant-eating aquatic mammals. 



Order Carnivora. Walruses, seals, dogs, cats, bears, weasels, 



foxes, wolves, etc. 



Order Primates. Lemurs, tarsiers, monkeys, apes and man. 



Equivalent Measurements 



Table 1 

 Units of Weight 



Examples 



A man may weigh 75 kilograms or 165 pounds. His heart weighs about 

 lOVi ounces, or 300 grams. He began life as a fertilized egg about 0.1 milli- 

 meters in diameter and weighing about 0.5 of a microgram. 



