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Eat and be eaten is the watchword of nature, as Christopher McGowan explains in The Raptor and the Lamb, an excursion through the living world from bacteria to whales. Rattlesnakes and sharks play their glamorous roles, but so do the little black berries in the trick ending to this enjoyable and informative book by an experienced nature writer. Published by Henry Holt, $25, ISBN 0805042989.