Sir David Attenborough first appeared in the landmark natural history series Life on Earth on 16 January 1979 - 45 years ago today.
The broadcaster and biologist wrote and presented the series, which took 3 years to make and saw Sir David travel all over the world.
In the first episode, he explored the South American rainforest and the Great Barrier Reef, providing a discreet commentary.
Some of the most memorable scenes from Life on Earth were when Sir David met gorillas, demonstrating the similarities between the animals and humans.
