Ravens are among the most elusive and yet (or, consequently) fascinating animals of North American I have ever encountered. Heinrich--an incredibly patient and cold-hardy fellow, not to mention, a heck of a writer--studied ravens in the dead of winter in Maine, and made some remarkable discoveries of how these normally solitary birds would actually engage in food sharing. Few of the many works on behavioral ecology I have read so compellingly capture the tedium of field work, the inscrutability of subject animals, and the satisfaction of discovery that provides even greater warmth than a blazing wood fire in the middle of a northern winter. Highly Recommended.