Sir David Attenborough , the esteemed broadcaster, naturalist, and national treasure, celebrates his 100th birthday on May 8 .

To mark this milestone, we present a selection of photographs you might not have seen before.

1950

Sir David is pictured here on his wedding day 76 years ago. He married his wife Jane at St Anne’s Church on Kew Green. She died in 2004.

Also pictured is his older brother Richard, the film actor and director, and member of the House of Lords, who died in 2014.

David Attenborough, younger brother of the film actor Richard Attenborough, married Miss Jane Oriel today at St. Anne's Church, Kew Green. (PA)

1955

Sir David visited British Guiana, now the independent country of Guyana, for one of his first programmes for the BBC – Zoo Quest.…