Muttonbird or mutton bird may refer to species of petrel, especially shearwaters, whose young are harvested for food and other uses before they fledge in Australia and New Zealand. The English term "muttonbird" originally emerged among settlers on Norfolk Island as the strong taste and fattiness of these birds' meat was likened to mutton. The Māori name for the birds, tītī, is also widely used in New Zealand.