07 April 2006
Vol 312, Issue 5770

About The Cover

Cover image expansion

COVER An ant of genus Ectatomma foraging at the Project Amazonas field station in Peru at sunset. An analysis of molecular data and fossils indicates that most subfamilies of extant ants originated 75 to 120 million years ago and diversified by about 60 million years ago. See page 101. Photo: Corrie S. Moreau