NATURAL 

 HISTORY 



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Natural Hislori (ISSN 0028-071 2) is published monlhly by 

 the American Museum of Natural History, Central Park West 

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In a Class by Themselves 



This month, in conjunction with the opening of the American Museum's 

 Halls of Fossil Mammals and Their Extinct Relatives, Natural History 

 celebrates the class Mammalia. Sixteen articles offer a sampling of the 

 diversity of these beasts and discuss the ways in which paleontologists 

 continue to learn about mammalian evolution and natural history. 



Although we include no articles on human ancestors, no snub is intended: 

 Human evolution commanded special sections in last year's April and May 

 issues, and an article containing an elegant theory of the evolution of 

 bipedalism ("Human Ancestors Walked Tall, Stayed Cool") appeared in 

 August 1993. But perhaps most memorable was Roger L. Welsch's 

 September column, "For Immediate Release," which finally explained the 

 Ice Age origins of snoring. 



2 Natural History 4/94 



