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
Zenaida dove Zenaida dove The zenaida dove ("Zenaida aurita") is a member of the bird family Columbidae, which includes doves and pigeons. It is the national bird of Anguilla, where it is commonly (but erroneously) referred to as a turtle dove. It lays two white eggs on a flimsy platform built on a tree or shrub. It also nests in rock crevices and on grassy vegetation if no predators are present. It has been recorded that some birds have up to 4 broods per year. Eggs take approximately two weeks to hatch, and the young chicks typically fledge after only two weeks