490 VERTEBRATE LIFE AND ORGANIZATION 



Figure 24.14. Monotremes and 

 marsupials. A, The duckbilled platypus; 

 B, the spiny anteater; C, opossum and 

 young; D, koala bear; E, kangaroo. The 

 platypus and anteater are monotremes; 

 the others are marsupials. (A and B, 

 courtesy of the New York Zoological 

 Society; C and D, courtesy of American 

 Museum of Natural History; E, Aus- 

 tralian News and Information Bureau.) 



