Poission patterns in behavioural time series: The perception of randomness in complexity

treatment did not have the expected effect of decreasing male success. I thank Seward Highley and Jonathan Meigs of the Millbrook School and Robert Roskow and family for permission to use the study sites, and the Schering Corporation of Bloomfield, New Jersey for providing flutamide. Peter Marler, Ken Yasukawa, and Patrick McArthur read and commented on drafts of the manuscript. This research was supported by grant no. 15125 awarded by NIMH. WILLIAM A. SEARCV Rockefeller University Field Research Center, Millbrook, New York 12545 U.S.A.