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AI processing of the Sussex recordings found the lesser spotted woodpecker's call four times, all in more than 1,300 hours recorded on the Gravetye Estate near East Grinstead. Experts at the Sussex Ornithological Society confirmed the calls. It was the first record of the species there in more than three decades, and two calls from the breeding season made a breeding pair likely. The director of the forestry firm that manages the estate's 167 hectares of woodland said that they could now leave dead trunks as habitat for the bird. 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