speciose being Pterodroma (eleven species), Puffinus (seven species), and Pachyptila (four species). The Hydrobatidae breeding in New Zealand are represented by four genera ( Oceanites , Pelagodroma , Fregetta and Garrodia ) and the Pelecanoididae is represented by a single genus, Pelecanoides . Status Of the 11 species of Procellariidae that breed only within New Zealand, the Chatham Island taiko, Pterodroma magentae , and Chatham petrel, P. axillaris , are classified by IUCN as "critically endangered". Cook's petrel, P. cookii , and Hutton's shearwater, Puffinus huttoni , are classified as "endangered". A further five species are considered "vulnerable" according to the IUCN classification system. The recently rediscovered New Zealand storm petrel, Oceanites Maorianus , is classified as "critically endangered" and awaits confirmation of its breeding site(s), in common with the Kermadec storm petrel, Pelagodroma marina albiclunis , an endemic subspecies nesting on the Kermadec Islands. Key Locations Key locations for most of the petrel species within New Zealand are largely restricted to offshore and predator-free islands, in particular, the Kermadec Islands, the Three Kings Islands, islands in the Hauraki Gulf and Bay of Plenty, the Chatham Islands, Stewart Island, and the subantarctic islands. The Hutton's shearwater breeds in the Seaward Kaikoura Range, the Westland petrel, Procellaria westlandica , in the coastal hills south of Punakaiki, and the mottled petrel, Pterodroma inexpectata , on islets in Fiordland and islands further south. Summary of Threats By far the major threats are from introduced predators and through habitat loss. Petrels and shearwaters have