Bird migration as they ride the "roaring forties" outside the breeding season. The tubenoses spread widely over large areas of open ocean, but congregate when food becomes available. Many are also among the longest-distance migrants; sooty shearwaters "Puffinus griseus" nesting on the Falkland Islands migrate between the breeding colony and the North Atlantic Ocean off Norway. Some Manx shearwaters "Puffinus puffinus" do this same journey in reverse. As they are long-lived birds, they may cover enormous distances during their lives; one record-breaking Manx shearwater is calculated to have flown 8 million km (5 million miles) during its over-50 year lifespan. Some large
Diego Garcia Other nesting native birds include red-tailed tropicbirds ("Phaethon rubricauda"), wedge-tailed shearwaters ("Puffinus pacificus"), Audubon's shearwater ("Puffinus iherminierii"), black-naped terns ("Sterna sumatrana"), white (or fairy) terns ("Gygis alba"), striated herons ("Butorides striatus"), and white-breasted waterhens ("Amaurornis phoenicurus"). The 680-hectare Barton Point Nature Reserve was identified as an Important Bird Area for its large breeding colony of red-footed boobies. The island hosts introduced bird species from many regions, including cattle egrets ("Bubulcus ibis"), Indian barred ground dove, also called the zebra dove ("Geopelia striata"), turtle dove ("Nesoenas picturata"), Indian mynah ("Acridotheres tristis"), Madagascar fody ("Foudia madagascariensis"), and chickens ("Gallus gallus"). Currently, three