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New research shows Europe's largest marine predators have dangerously high levels of banned chemicals in their blubber, which impacts on breeding and the health of newborn calves. The chemicals – called PCB’s – have stayed in the marine environment, making their way up the food chain, accumulating in the tissues of top predators like killer whales and bottlenose dolphins. Dr. Paul Jepson, from London Zoo, is one of the authors of the study. Photo: Scottish orca stranding Credit: ©Scottish Marine Animal Strandings Scheme