The birds of Pitcairn fall into several groups. These include seabirds, wading birds and a small number of resident land bird species. Of 20 breeding species, Henderson Island has 16, including the unique flightless Henderson rail (Nesophylax alter); Oeno 12; Ducie 13 and Pitcairn six. Of the birds breeding on Pitcairn the best known are the Fairy Tern (Gygis alba), the Common Noddy (Anous stolidus) and the Red-tailed Tropic Bird (Phaethon rubricauda). The Pitcairn Island Warbler (Acrocephalus vaughani) or known by Pitcairners as a sparrow, is a native species, dark-brown above and yellowish to buff below. It use to be common throughout the island but was placed on the endangered status list in 2008 (see Pitcairn Reed-warbler).