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Sept 22 (Reuters) - British naturalist David Attenborough on Thursday unveiled a portrait of himself, commissioned for this 90th birthday, at the same museum where he used to volunteer as a teenager.

The painting, by portrait artist Bryan Organ, is displayed at New Walk Museum and Art Gallery in the English city of Leicester, where a portrait of Attenborough’s late brother, actor and film director Richard Attenborough, also hangs.

Attenborough, who has travelled the world for decades making television documentaries, turned 90 in May.