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 Cherubini made the courageous decision to use his discretionary powers and take personal responsibility for authorising a special performance whose takings would be divided equally between the Académie and Lays. Even if it is unclear what right the director of the École royale de musique et de déclamation had to make such a decision, the performance did in fact take place at the Opéra on 20 November 1826. The programme consisted of Boieldieu's opéra comique "Le calife de Bagdad"; the second act of "Anacréon chez Polycrate", in which Lays played his most famous role for the last time; and the