Great black-backed gull stomach contents of great black-backed gulls was made up of birds, while a further 17% of stomach contents was made up of tern eggs alone. Adult or fledged juveniles of various bird species have also been predaceously attacked. Some fully-fledged or adult birds observed to be hunted in flight or on the ground by great black-backed gulls have included "Anas" ducks, ruddy ducks ("Oxyura jamaicensis"), buffleheads ("Bucephala albeola"), Manx shearwaters ("Puffinus puffinus"), pied-billed grebes ("Podilymbus podiceps"), common moorhens ("Gallinula chloropus"), terns, Atlantic puffins ("Fratercula arctica"), coots ("Fulica" ssp.), glossy ibises ("Plegadis falcinellus"), rock pigeons ("Columba livia") and even predatory birds
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