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 in 1807 to celebrate Napoleon's return to the capital. Not wanting to hurt the French public's feelings, Alexander requested a staging of Spontini's "La vestale" instead, an opera in which Lays always assumed the role of Cinna. At the end of the performance, the angry audience forced Lays – still dressed in his Roman toga – to return to the stage and recite some popular verses thanking the tsar for restoring the Bourbons. According to the brothers Michaud, Alexander was moved to compassion by the sight of the terrified singer and sent one of his aides-de-camp on stage to reassure