During several austral summers covering a 13 year period, we collected a random sample of body feathers from chicks of 11 sympatric species of Procellariiform (wandering albatross Diomedea exulans -79 individuals in total-, black-browed albatross Thalassarche melanophris - 51-, grey-headed albatross T. chrysostoma - 58 -, light-mantled sooty albatross Phoebetria palpebrata - 34 -, northern giant petrel Macronectes halli - 59 -, southern giant petrel M. giganteus - 60 -, white-chinned petrel Procellaria aequinoctialis - 39 -, blue petrel Halobaena caerulea - 19 - , Antarctic prion Pachyptila desolata - 19 -, South Georgian diving petrel Pelecanoides georgicus - 2 - and common diving petrel P. urinatrix - 6 -) to analyse Delta15N and Delta13C.

The diets of Macaroni Penguin (Eudyptes chrysolophus) and Gentoo Penguin (Pygoscelis papua) have been monitored on Bird Island since 1989. This dataset comprises data on composition of diet samples (Crustaceans, Cephalopod and fish) and measurements of krill carapaces, fish otoliths and squid beaks found in the samples. These measurements are used to estimate the length and weight of krill, fish and squid that have been consumed.