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Newell's shearwater or Hawaiian shearwater (ʻaʻo), (Puffinus newelli) is a seabird in the family Procellariidae. It belongs to a confusing group of shearwaters which are difficult to identify and whose classification is controversial.
ʻAʻo (Newell's shearwater, Puffinus newelli) is a medium-sized shearwater measuring 12–14 in (30–36 cm) with a wing span of 30–35 in (76–89 cm). It has a glossy black back and white belly and a black bill that is sharply hooked at the tip.
Puffinus is a genus of seabirds in the order Procellariiformes that contains about 20 small to medium-sized shearwaters.Two other shearwater genera are named: Calonectris, which comprises three or four large shearwaters, and Ardenna with another seven species (formerly often included within Puffinus).
Hutton's shearwater (Puffinus huttoni) breeds in burrows on the sea-facing mountainside of the Kaikoura Ranges on South Island, New Zealand. The colonies are 1,200–1,800 m (3,900–5,900 ft) above sea level at a distance of 12–18 km (7.5–11.2 mi) from the coast.
Streaked shearwater, Calonectris leucomelas (A) Flesh-footed shearwater, Ardenna carneipes (A) Wedge-tailed shearwater, Ardenna pacificus; Buller's shearwater, Ardenna bulleri (A) Sooty shearwater, Ardenna griseus (A) Short-tailed shearwater, Ardenna tenuirostris; Christmas shearwater, Puffinus nativitatis; Newell's shearwater, Puffinus newelli (A)
Many shearwaters are long-distance migrants, perhaps most spectacularly sooty shearwaters, which cover distances in excess of 14,000 km (8,700 mi) from their breeding colonies on the Falkland Islands (52°S 60°W) to as far as 70° north latitude in the North Atlantic Ocean off northern Norway, and around New Zealand to as far as 60° north latitude in the North Pacific Ocean off Alaska.