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- In the company of crows and ravens, John M. Marzluff and Tony Angell ; illustrated by Tony Angell ; foreword by Paul Erhlich
- Gifts of the crow, how perception, emotion, and thought allow smart birds to behave like humans, John Marzluff, Tony Angell
- The enigma of the owl, an illustrated natural history, Mike Unwin and David Tipling ; foreword by Tony Angell
- Gifts of the crow, how perception, emotion, and thought allow smart birds to behave like humans, John M. Marzluff and Tony Angell ; illustrated by Tony Angell