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Cameras in Chester Zoo revealed rare insight into the lives of giant pangolins, one of the world's most trafficked mammals.The footage shows a pangolin sitting on its powerful tail while grasping at a tree with its claws. Another clip shows a baby clinging to the back of an adult as it rummages through bushes. Researchers hope the videos provide new insights into the secretive nocturnal species, which is being pushed to extinction by illegal hunting and trafficking.