 He died shortly before his 101st birthday in 2006.He was a contributing editor of "Birder's World" magazine, culminating with an article about American Crow behavior observations of his own, plus his own watercolors of crows performing the behaviors in the text.He died with the wish of revising his 1980 "Audubon Encyclopedia of North American Birds", about which Roger Tory Peterson said never left his desk side.