Return of the documentary going behind the doors of the London museum. A young dinosaur researcher scans a giant tooth-filled jawbone belonging to a Gorgosaurus which may reveal the secret of its success 80 million years ago. Elsewhere, the museum's team of experts help a schoolgirl identify a stone she found in her playground, and fly expert Erica heads to the Knepp Estate in Sussex in search of new insect species.

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