This book by the late Lawrence Kilham was first published in 1983 by the Nuttall Ornithological Club, then later re-issued by Dover Publications, New York, in 1992. It is out-of-print but still fairly easy to find. It is a great book by a great observer of woodpeckers. It mainly covers Downy, Hairy, Black-backed, Pileated, Red-headed and Red-bellied Woodpeckers, Yellow-bellied Sapsucker and Northern Flicker, and to a lesser extent Crimson-crested and Pale-billed Woodpeckers. It is fact-filled, the facts mostly established by the author himself over years of devoted observation and study of both wild and captive picids.