Photograph of Yellow-headed Blackbird - (c) Paul Marto

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Reference Resources

Birds of North America

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Species accounts on North American birds, with information about their characteristics, distribution, systematics, behavior, ecology, demography, and conservation. Co-produced by AOSCornell Lab of Ornithology, and Academy of Natural Sciences. Free for AOS members (read more »).

Neotropical Birds

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Species accounts on Neotropical birds, with information about identification, distribution (including interactive maps), systematics, life history, conservation, and priorities for future research. Produced by the Cornell Lab of Ornithology. Available free of charge.

Searchable Ornithological Research Archive

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A collaboration between the AOU, COS, Association of Field Ornithologists, Wilson Ornithological Society, and the University of New Mexico Libraries. Provides access to ornithological literature in North America since 1884, including both The Auk (1884- ) and The Condor (1899- ).

Biodiversity Heritage Library

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A consortium of natural history and botanical libraries digitizing the legacy literature held in their collections. Provides access to some ornithological titles not found in other bird-specific archives, including museum publications and field notes. Available free of charge. 

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