Giant egg from extinct elephant bird up for auction

A rare giant bird egg is being auctioned at Christie's auction house in London.

It was laid by an Elephant Bird in Madagascar and is thought to have been discovered by archaeologists in the late 19th or early 20th century.

The species became extinct sometime between the 13th and 17th centuries.

James Hyslop, scientific specialist at Christie's said, "the egg is the largest egg ever laid by any animal, they are bigger than dinosaur eggs."