The Duke and Duchess of Cambridge, Prince George (seated), Princess Charlotte and Prince Louis with Sir David Attenborough in the gardens of Kensington Palace. Reuters

Sir David Attenborough delighted Prince George with a fossilised giant shark's tooth to mark their meeting at Kensington Palace grounds.

The young prince was photographed looking captivated as he handled the fossilised tooth from an extinct Carcharocles megalodon — one of the most feared predators to have swum in the seas.

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The giant shark tooth given to George was found by Sir David during a family holiday to Malta in the late 1960s.

 Sir David found the tooth during a family holiday to Malta in the late 1960s. Reuters

It was embedded in the island's soft yellow limestone, which was laid down during the Miocene period some 23 million years ago.

Carcharocles megalodon is believed to have grown to 15 metres in length, which is about twice the length of the great white shark.

Sir David presented the 7-year-old with the gift after he attended an outdoor royal screening of his new environmental documentary with the Duke of Cambridge.

The event was held in the palace grounds to facilitate social distancing.

Prince William and the veteran broadcaster watched “A Life on Our Planet” at a social distance and in the open air.

  Sir David visited the palace for a private viewing of his new environmental documentary with the Duke of Cambridge.

The duke and Sir David were given directors' chairs with their names printed on the back, but they decided to sit in each other's seats.

The 94-year-old broadcaster chatted with William, Kate and their three children George, Princess Charlotte and Prince Louis after the screening.

William interviewed Sir David at the World Economic Forum in Davos, Switzerland, last year, and during the discussion the broadcaster warned that humanity needed to act so that they did not “annihilate part of the natural world.”

The two men continue to support each other in their mission to tackle some of the biggest environmental challenges the planet faces.

This includes working together on William's Earthshot Prize, an ambitious global environment project announced last December to combat climate issues.