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 marry his companion, even though it was against his father's wishes. Old Lay was furious that his eldest child, who enjoyed a successful career, was marrying a foreign woman with no property. The couple went on to have four more children, including one son who would unwittingly cause Lays enormous grief. In the same year, Lays politely refused Napoleon's invitation to join him on his expedition to Egypt. Nevertheless, the pair remained on friendly terms and between 1801 and 1802, Lays – who had often performed in Josephine's salons – became chief singer of the Chapel Napoleon had established at