What is the weight of the ostrich egg?
The world’s largest living bird–the ostrich–lays the heaviest egg and she lays six to eight of them while she’s at it. Each is about six inches long and weighs up to 2½ pounds. That’s 24 chicken eggs in volume. The shell is 0.06 of an inch thick (the diameter of a pinhead) but can support the weight of an adult human. The largest ostrich egg on record was laid in 1988 on a collective farm in Israel. It weighted 5 lb. 2 oz. The extinct giant Elephant Bird (Aephornis maximus) of Madagascar laid eggs as big in volume as seven ostrich eggs and bigger than any dinosaur egg. They were the largest single-cells that ever existed on Earth. By the way, the half-ton Elephant Bird became extinct fairly recently: about 1700. The figure shows eggs of various modern reptiles and birds: Clockwise from the upper-left: an ostrich egg, crocodile eggs, one set of tortoise eggs, another set of tortoise eggs, and an Elephant Bird egg. All based on the same scale: a 6-inch long ostrich egg.