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Paine, Stefani. The world of the arctic whales : belugas, bowheads, and narwhals. San Francisco: Sierra Club Books, 1995.
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Savage, Candace Sherk. Bird brains : the intelligence of crows, ravens, magpies, and jays. San Francisco: Sierra Club Books, 1995.
Wolfe, Art. The kingdom : wildlife in North America. San Francisco: Sierra Club Books ; Washington, D.C. National Wildlife Federation, 1990.