Elephans

Cameras have revealed how elephants are able to get a drink of fresh water when faced with a stagnant waterhole.

A BBC team discovered that the tusked giants use their trunks to delicately siphon off clean liquid that has settled at the top of the dirty pool.

The Natural History Unit says this is the first time this behaviour has been seen.

The footage forms part of Nature's Great Events: The Great Flood, which follows the annual flooding of Botswana's Okavango Delta.