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
Oyster toadfish close by, then attack by surprise. They can be found near the shore from Maine to the Florida. The fish has a distinctive "foghorn" sound used by males to attract females in the mating season, which is April–October. The sound-producing (sonic) muscles attached to its swimbladders are the fastest known vertebrate muscles. Following the foghorn sound, the female comes into the nest, lays eggs, and then leaves (the toadfish lays the largest eggs of any Chesapeake Bay fish). The male fertilizes the eggs; they hatch after about one month. When the eggs hatch, the young toadfish stay attached to the