His lab once banded American crows while wearing various masks, which demonstrated that crows identify and remember people's faces. His work combines science, anecdotes, and humor. In Subirdia, Marzluff shows how seven "exploiter" birds have enlarged their territories by taking advantage of human-made changes to the environment, and discusses how we could make our back yards better for birds. In Gifts of the Crow, Marzluff and Angell documented how intelligent crows are, with both anecdotes and research. They discuss the ways that crows are like humans, and the many different ways that humans have treated crows. In the Company of Crows and Ravens was written with and illustrated by Tony Angell. John Marzluff (born 1958) is a professor of wildlife science at the University of Washington and an author.
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