Sir David Attenborough has become synonymous with extraordinary, enthralling and revealing footage of the natural world.

Over more than six decades, the naturalist and broadcaster has filmed and narrated some of the most memorable wildlife scenes ever recorded.

Here are five of his best moments.

Even better, you can watch a further 1000 more, for free, anytime, on your smartphone or tablet, via Attenborough's Story of Life app, which is now available to download via Google Play, or Apple's app store.

Giraffes in epic battle, from Africa

Polar bear versus walruses, from Planet Earth

Criminal penguins steal stones, from Frozen Planet

Jesus Christ lizard runs on water, from Life

Sugar glider's stunning flight, from Life on Earth

Find out more at http://www.bbc.com/earth/storyoflife.

The Story of Life has been produced in collaboration with Sir David Attenborough, BBC Earth and ideas and innovation company AKQA.