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Martin Hughes-Games visits a zoology department and describes how the collection of animals has helped people to study evolution. Some animals have been dried out, some have been stuffed and other specimens are only skeletons. He looks at four limbed animals’ skeletons and how they are adapted for different functions. These include a bat, dog, mole and a monkey. He also compares the structure of a dolphin’s flipper to a human arm to explain the similarities in structure. Charles Darwin used these observations to develop his theory that we have a common ancestor.