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A remarkable journey into the secret world of one of the most endangered and least understood animals on earth – bats. With cutting-edge night-vision cameras and ultrasonic detectors, this programme follows a greater horseshoe bat roost for four months during the summer of 2019, capturing the hidden life of the colony as never before. Witness the birth of a new generation of pups and follow their progress towards their perilous maiden flight outside the roost.