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
François Lays years of hardship, during which his need to provide a dowry for his eldest daughter Marie-Cécile forced him further into debt. Quéruel relates that Lays was finally reinstated only on 9 January 1821, but this assertion cannot be accurate because the singer's name often appeared on the theatre bills in the mean time, for example the whole period between July 1819 and June 1820. Whatever the case, in response to his renewed demands for economic support, the administration granted him further leave to perform privately outside Paris. Lays went on a tour of the Low Countries and also put on