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
Bird egg birds with small clutch size tended to be indeterminate. Many animals feed on eggs. For example, the principal predators of the black oystercatcher's eggs include raccoons, skunks, mink, river and sea otters, gulls, crows and foxes. The stoat ("Mustela erminea") and long-tailed weasel ("M. frenata") steal ducks' eggs. Snakes of the genera "Dasypeltis" and "Elachistodon" specialize in eating eggs. Humans have a long history of both eating wild bird eggs and raising birds for farmed eggs for consumption. Brood parasitism occurs in birds when one species lays its eggs in the nest of another. In some cases, the host's eggs