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 at the École royale de Musique et de Déclamation, which had replaced the Conservatoire. The salary was indispensable to Lays because his gout meant he was no longer able to appear at the Opéra as regularly as he had done, leading to a drastic reduction in extra income. In 1816, Lays had the satisfaction of enjoying one final triumph in the comic opera "Le rossignol" by Louis-Sébastien Lebrun (1764–1829), set in the foothills of his native Pyrenees. Lays took one of his favourite stock parts, "a bailiff in his fifties, a lover of good food and beautiful young women, naive