2. Kalu the chimpanzee: £53 million (Andrew Brown/ Rex Features)

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Second on Petplan's list of prosperous pets is Kalu the chimpanzee, worth an estimated £53 million. He inherited Patricia O'Neill's fortune after she separated from her husband, famous swimmer Frank O'Neill. While other chimps might be content in a tree, Kalu relaxes in a plush Cape Town estate.

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