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
Northern jacana territory. This bird lays a clutch of four brown eggs with black markings. These eggs usually measure around . The male incubates the eggs for 28 days. A female may sometimes shade and squat over the eggs but rarely incubate them. A female may reluctantly incubate the eggs if a male doesn’t have sufficient time to forage throughout the day due to rain and cool temperatures. Males spend most of their time within their territory during incubation but sometimes leave the nest unattended for long periods of time. A male performs when each egg hatches and stands next to the