World's Oldest Living Animal

As a photograph it looks fairly unremarkable - a tortoise nibbles at the grass in front of a Boer War prisoner and guard.

But the pictures helps to mark the animal as the oldest animal on the planet.

Jonathan, the tortoise, is believed to be 176-years-old and was about 70 at the time the black and white picture was taken. He was photographed during the Boer War around 1900.