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 Lays and, regarding it as null and void, intended to sue him for damages for missing performances at the Opéra. The confrontation lasted for more than a year until, in 1823, the moment came for Lays to leave the Opéra after almost 45 years of outstanding service. The benefit concert, to which artistes were entitled on their retirement, took place on 1 May. The performance ended with "Le rossignol", during which almost all the stars who did not have roles in the opera paid homage to their respected and well-liked colleague by appearing on stage in the chorus. The first