IBA Trigger species: Chatham Island Shag, Pitt Island Shag, Chatham Oystercatcher, Red-fronted Parakeet, Weka (Buff Weka)
Besides the trigger species the following species are confirmed or likely to be breeding: Little Penguin, Sooty Shearwater, Common Diving Petrel, Broad-billed Prion, Brown Skua, Southern Black-backed Gull, Red-billed Gull, White-fronted Tern, White-faced Heron, Mallard, Pukeko, Australasian Harrier, Spur-winged Plover, Welcome Swal-low, Chatham Island Pipit, Shining Cuckoo, Silvereye, Chatham Island Warbler, Chatham Island Tomtit, Chatham Island Fan-tail, Chatham Island Tui, Skylark, Hedge Sparrow, Blackbird, Song Thrush, Yellowhammer, Chaffinch, Greenfinch, Goldfinch, Redpoll, House Sparrow, Starling.
Other species recorded: Turnstone.
BirdLife International (2020) Important Bird Areas factsheet: Rangiauria Pitt Island. Downloaded from http://www.birdlife.org on 03/12/2020.