Pioneering guide to identifying the birds of the USA and Canada, covering nearly all species to be recorded there, and many vagrants. Reflecting the most recent taxonomic changes, the guide also utilises recent advances in our knowledge of bird identification, and the most up-to-date information on species distribution. Each double-page entry contains extensive illustrations of the species concerned, with notes on their identification, distribution, and ecology. Species for which there is a conservation concern are highlighted within the text.