According to an analysis of eggshell fragments found at the Old Town archaeological site, scarlet macaws (Ara macao) were being bred in what is now New Mexico during the 1100s. Cyler Conrad and his team studied six of these eggshell fragments, which were discovered alongside the articulated remains
Evidence from the Old Town archeological site suggests scarlet macaws were bred in today’s New Mexico in the 1100s, predating known breeding sites in Northwestern Mexico.
Using a non-destructive scanning electron microscope, the authors looked for evidence of fetal development inside the eggs, which can be inferred from the reabsorption of a layer of eggshell known as the mammillary cone. Five specimens showed clear evidence of reabsorption, and the samples included at least two separate eggs, based on the developmental ages identified.
According to the authors, the findings may help shed light on the practice of breeding and keeping macaws in the Americas.
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