Emu egg An emu egg weighs just over one- hundredth of the adult’s weight. Kiwi egg The egg is nearly one-quarter of the adult’s weight. Green to black The eggs of the Australian emu are a dull green colour when laid. Within a few days they turn black and glossy. Outsize egg The kiwi lays the largest egg in proportion to her body of any bird. Each egg weighs about 450 g (1 lb) and takes two and a half months to be incubated. Elephant bird egg Elephant bird eggs weighed approximately 12 kg (26 lb) each – about three per cent of the adult’s body weight – making them among the largest eggs ever laid. Elephant birds lived in Madagascar, and although they died out about 700 years ago, whole eggs have been uncovered in the island’s swamps. Emu Kiwi The volume of the elephant bird’s egg is more than twice that of any dinosaur’s egg .