IBA Trigger species: Chatham Island Shag, Pitt Island Shag, Fairy Prion, Grey-backed Storm Petrel, Chatham Oystercatcher, Chatham Snipe, Shore Plover, Chatham (Forbes') Parakeet, Red-fronted Parakeet (Chatham Island Red-crowned Parakeet), Black Robin
Besides the trigger species the following species are confirmed or likely to be breeding: Little Penguin, Black-winged petrel, Sooty Shearwater, Subantarctic Little Shearwater, Broad-billed Prion, White-faced Storm Petrel, Common Diving Petrel, Brown Skua, Southern Black-backed Gull, Red-billed Gull, White-fronted Tern, White-faced Heron, Mallard, Australasian Harrier, Welcome Swallow, NZ Pipit, Shining Cuckoo, Silvereye, Chatham Island Warbler, Chat-ham Island Tomtit, Chatham Island Fantail, Chatham Island Tui, Skylark, Hedge Sparrow, Blackbird, Song Thrush, Chaffinch, Redpoll, Starling.
Other species recorded: Leach’s Storm Petrel (Rabbit Island)
BirdLife International (2020) Important Bird Areas factsheet: Mangere. Downloaded from http://www.birdlife.org on 25/11/2020.