World's Biggest Frogs Captured on Camera Lifting Rocks Nearly Two-thirds Their Body Weight

The world's biggest frogs have been captured on camera lifting rocks - nearly two-thirds their body weight as they build paddling ponds for their young.

They use the large pebbles and stones to erect dams and ponds to protect their offspring.

It is the first example of 'nest'-building in an African amphibian - and could explain how the Goliath frog grew into a giant.

Adults were observed in the wild moving rocks weighing up to 4.4lbs (two kilos) to construct the watery abodes, which they then guard.