The Birds of Sonora describes all the species known from that state and includes information on distribution, seasonal patterns of occurrence, abundance, and habitats. It contains details of nesting activity for breeding species, provides insight into factors influencing distribution, and notes historical changes in status. Because other books on Mexican birds don't treat Sonora in detail, The Birds of Sonora is an indispensable resource for birders, and its background descriptions of Sonoran geography, climate, and habitats also make it a key reference for conservation and land use planning.