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The kiwi's egg occupies up to 25 percent of its mother's body, making it the largest egg, proportional to body size, of any bird in the world, according to the American Museum of Natural History (AMNH) in New York City. That's one egg-treme egg to lay! Due to the egg's size, kiwi birth is equivalent to a chicken laying a 1-lb. (0.4 kg) egg or a human giving birth to a 4-year-old child, according to Audubon. Luckily, there's an upside to mom's large load. The egg is so big that the baby is fairly developed by the time it hatches, according to the AMNH.
Animal Moms Have It Tough! 5 Extreme Creature Births
The kiwi's egg occupies up to 25 percent of its mother's body, making it the largest egg, proportional to body size, of any bird in the world, according to the American Museum of Natural History (AMNH) in New York City. That's one egg-treme egg to lay! Due to the egg's size, kiwi birth is equivalent to a chicken laying a 1-lb. (0.4 kg) egg or a human giving birth to a 4-year-old child, according to Audubon. Luckily, there's an upside to mom's large load. The egg is so big that the baby is fairly developed by the time it hatches, according to the AMNH.