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Fig. S1 (a) d15N values of decalcified and untreated samples from 15 individuals.

Fig. S2 (a) Type 1 killer whales; the eye patch has a parallel orientation and the anterior end is in front of the blowhole (photo credit Andrew Foote). This pigmentation pattern was found in photographic data of killer whales from Norway, Iceland, Shetland and the North Sea and in photographs of eight stranded type 1 individuals sampled in this study. (b) Type 2 killer whales; the eye patch has an angular orientation and the anterior end is behind the blowhole (photo credit Lewis Drydale, HWDT). This pigmentation pattern was found in a small community of individuals on the west coast of Scotland, and individuals off the Azores (Karin Hartman; Annette Scheffer unpublished data) and one type 2 individual sampled for this study.

Fig. S3 A free-ranging killer whale photographed feeding on mackerel in the North Sea exhibits severe apical tooth wear in the front teeth (photo credit Harriet Bolt).

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