Guy Bell/Shutterstock
Bigger than any dinosaur egg, this cracking object is up for sale at auction house Christie’s. Laid by an elephant bird, the egg is 30.5 centimetres tall and equivalent in volume to 150 or so chicken eggs. Endemic to Madagascar, elephant birds (Aepyornis maximus) were flightless. They reached 3 metres tall, making them the largest birds to have lived, and went extinct about 1000 years ago.
