Walter D. Koenig received his Ph.D. in zoology in 1978 from the University of California, Berkeley, where he is currently an adjunct professor in the Department of Integrative Biology and a research zoologist@the Museum of Vertebrate Zoology. His research interests include social behavior of birds, reproductive traits of forest trees and patterns of spatial synchrony in nature. Address: Hastings Natural History Reservation, 38601 E. Carmel Valley Road, Carmel Valley, CA 93924. Internet: wicker@berkeley.edu