pic.twitter.com/MTQ68WnOrtThe 94-year-old broadcaster chatted to William, Kate and their three children George, Princess Charlotte and Prince Louis after the screening on 26 September.
The eager questions were preceded by a gift brought by Sir David for Prince George - a 23 million-year-old giant shark tooth.
The Carcharocles megalodon tooth given to George was found by Sir David during a family holiday to Malta in the late 1960s.It was embedded in the island's soft yellow limestone, which was laid down during the Miocene period some 23 million years ago.Sir David recently joined Instagram at the age of 94, on September 24 with his first post declaring that saving the planet is a "communications challenge".After 60 years making television.
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