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 determined to abandon a career in the Church and became increasingly active as a singer, joining the cathedral choir and accepting invitations to perform at local salons. In Toulouse, Lays formed a lifelong friendship with the young lawyer Bertrand Barère, the future French Revolutionary politician and member of the Committee of Public Safety. Barère introduced Lays to the city's Enlightenment circles. On Easter Sunday 1779, Lays was singing the liturgy in the cathedral when he was heard by the Intendant Royal of Languedoc. Following the recruitment practice then used by Académie Royale de Musique (the Paris Opéra), the Intendant decided