Adults start to occupy the nest in September. The egg laying period takes place from October to late November. Chicks fledged at 3 months. The peak egg-laying period varies locally and becomes progressively later at higher latitudes. Nesting materials include marine algae, feathers, sticks and shells and cemented guano. Brood reduction is common and typically involves the last-laid egg. A pair will lay 3 eggs and rear 2 or 1 young.