I WW- 



mm 



JULY/AUGUST 2006 



The Scaly Ones 



Squamata — lizards and snakes — have spread to almost 

 every landmass and branched into more than 7,200 species. 

 Ecological and molecular studies are bringing their family 

 tree more clearly into focus. 



By Laurie J. Vitt and Eric R. Pianka 



