Examination of avian eggshell at the Old Town archaeological site in Southwestern New Mexico, United States of America, indicates that scarlet macaw () breeding occurred during the Classic Mimbres period (early AD 1100s). Current archaeological and archaeogenomic evidence from throughout the American Southwest/Mexican Northwest (SW/NW) suggests that Indigenous people bred scarlet macaws at an unknown location(s) between AD 900 and 1200 and likely again at the northwestern Mexico site of Paquimé post-AD 1275. However, there is a lack of direct evidence for breeding, or the location(s) of scarlet macaw breeding itself, within this area. This research, for the first time, provides evidence of scarlet macaw breeding using scanning electron microscopy of eggshells from Old Town.
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