The Pileated woodpecker (Dryocopus pileatus, formerly Picus pileatus), is a very large North American woodpecker, roughly crow-sized, inhabiting deciduous forests in eastern North America, the Great Lakes, the boreal forests of Canada, and parts of the Pacific coast. It is also the largest woodpecker in the United States, except the possibly extinct ivory-billed woodpecker (Campephilus principalis).