At Machias Seal Island, Razorbills begin laying eggs in mid-May. Only one egg is laid and the chick is fed by both parents. The chick leaves the nest 18 to 20 days after hatching. It follows the adult male out to sea. This is fairly unusual because it is not yet fully grown; it is only 25% to 30% as big as an adult. At first, the adult feeds the chick, but within a month the chick can feed itself.