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wild dolphins and recent mishaps with the big animals are giving the Federal warning campaign a new degree of urgency. Federal officials say dolphins pose little threat to people in captive swim programs, where the animals are usually well-trained and closely supervised by experts working in pools and enclosed bays. During the past five years, the number of such businesses have risen to 18 from 4, said Dr. Barbara A. Kohn, a veterinarian at the Department of Agriculture’s Animal and Plant Health Inspection Service, which oversees the field. And more such tourist attractions are planned. Dr. Read of Duke University, a porpoise expert who is aiding the Virginia study, said evolutionary factors seemed a likely explanation for the infanticide. The porpoise deaths, he added, were harder to understand. The two kinds of marine mammals eat different fishes, he said, so food competition is unlikely. ”And there are very few instances when one mammal kills another when there is no risk of predation,” Dr. Read added. Everybody loves dolphins, those playful models of animal wisdom,

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