Egg embryo is adequately developed it hatches, i.e. breaks out of the egg's shell. Some embryos have a temporary egg tooth they use to crack, pip, or break the eggshell or covering. The largest recorded egg is from a whale shark, and was in size. Whale shark eggs typically hatch within the mother. At and up to , the ostrich egg is the largest egg of any living bird, though the extinct elephant bird and some dinosaurs laid larger eggs. The bee hummingbird produces the smallest known bird egg, which weighs half of a gram (around 0.02 oz). Some eggs laid
Lesser bird-of-paradise larger greater bird-of-paradise, but the male of that species has a dark chest, whereas the female is entirely brown (no whitish underparts). The males are polygamous, and perform courtship displays in leks. The female usually lays two pinkish eggs with dark markings in a nest in a tree high above ground. Its diet consists mainly of fruits and insects. The lesser bird-of-paradise is distributed throughout forests of northern New Guinea, and the nearby islands of Misool and Yapen. Widespread and common throughout its large range, the lesser bird-of-paradise is evaluated as Least Concern on the IUCN Red List of Threatened