Sir David Attenborough: Tributes paid as he turns 90

Tributes have been paid to renowned naturalist and broadcaster Sir David Attenborough who has turned 90. Sir David joined the BBC after serving in the Royal Navy from 1947 to 1949 and launched Zoo Quest in 1954. A string of successful natural history programmes followed including Life On Earth, The Living Planet, The Trials Of Life, The Blue Planet and Planet Earth.
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