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
White-whiskered puffbird White-whiskered puffbird The white-whiskered puffbird ("Malacoptila panamensis") is a resident breeding bird species from southeastern Mexico to central Ecuador. It is sometimes known as the white-whiskered softwing. This puffbird is found in forests, shady plantations, especially of Theobroma cacao, and old second growth in lowlands and foothills up to 1200m. It nests in a long, diameter burrow in, usually, gently sloping ground. The wider nesting chamber is lined with dried leaves. The female lays two, rarely three, glossy white eggs. Both sexes incubate the eggs and feed the young. The white-whiskered puffbird is a stout, large-headed, long bird which weighs