Both ovaries of female kiwis are functional (other birds have only left ovary) and they lay huge eggs. One egg is sized as 20% of the female's body. When comparing egg to body ratio, kiwi produces bigger eggs than ostriches. In some species, male sits on the egg until it hatches. ...
The female builds a nest of vegetation, sticks, leaves, and mud in a sheltered spot in or near the water. After she lays her 20 to 50 white, goose-egg-sized eggs, she covers them under more vegetation, which, like mulch, heats as it decays, helping to keep the eggs warm. This di...