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As part of a season of programming marking Sir David Attenborough's 90th birthday, four of his favourite films are brought together as the renowned naturalist looks back on his personal highlights.

First transmitted in 1989, Lost Worlds, Vanished Lives showcases the world's major fossil sites. In a number of specially shot interviews, Attenborough introduces extracts from the series where he reveals ancient sea creatures, sabre-toothed predators and immense dinosaurs.

Groundbreaking for its time and still as relevant now, the series explores how fossils fire the imagination and teach us not just about the lives of long-extinct animals, from gentle giants like the brachiosaurs to the greatest predators ever to roam the earth - tyrannosaurs, but also the world they lived in.