Researchers examined vessels from Late Chalcolithic institutional contexts at Shakhi Kora in the Kurdistan Region of Iraq, combining residue analysis with isotope evidence, plant remains, animal remains and archaeological context. The vessels preserve evidence of food use over several centuries.

The findings point to a varied food supply that included domestic and wild animal resources, freshwater foods, plants and dairy products. The researchers say this suggests animal protein was available to a broader range of people, and was eaten more often, than some reconstructions based mainly on early written records have proposed.