Pigs were selected for analysis, as they were the principal domesticate at all four sites and were most likely to represent the remains of feasts. Samples for each site are listed in table S1. The sampling strategy was described separately for each isotope method below. All samples were confidently assigned to Late Neolithic deposits, although precise contextual information was unavailable for Mount Pleasant (remains were boxed by phase). Mandibles with a first molar that was in wear were favored for analysis. This would likely provide comparable snapshots of early life origins, and teeth in wear will have (at the very least) neared completion of the mineralization process. This sampling strategy was possible for all Durrington Walls samples, but a degree of flexibility was required for the other sites. The principal criteria for other sites were that remains could be confidently assigned to a Late Neolithic phase on the basis of radiocarbon dates, stratigraphy, and associated Grooved ware pottery and that teeth were in wear. Because of less detailed paper archives than for Durrington Walls, many samples had to be excluded because of the provenance being less than secure. Therefore, sample numbers are far smaller for the other sites, and in several instances, different teeth have been sampled. However, every effort was made to analyze a part of the tooth that developed at approximately the same period in the animal’s development (see details on sampling for each isotope method below). It was not possible to always sample the same-sided elements, but the variation in isotope results demonstrates that repeat sampling of the same individual was not a problem in this study. The vast majority of remains were recovered from middens, large spreads of material culture presumed to result from feasting. In some instances, remains from pits, ditches, and postholes were also analyzed. Care was taken to avoid the sampling of wild boar, and large outliers were avoided. Chronologically later samples from WKPE were also carefully avoided. More details on specific sampling strategies for each isotope system are provided in the Supplementary Materials.

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