A new study covering 159 species of butterfly that were monitored for over 35 years has just been published in the Proceedings of the National Academy of Sciences. This is the first major paper resulting from the remarkable research program of Professor Art Shapiro at UC Davis. Art's project consists of 11 sites which he visits every two weeks, and extend from Suisun Marsh in the Bay Area, across the central valley, and up and over the Sierra Nevada to a final point at Sierra Valley on the east side.