Editing Chicken (section)

=== Americas ===

The possibility that domestic chickens were in the Americas before Western contact is debated by researchers, but blue-egged chickens, found only in the Americas and Asia, suggest an Asian origin for early American chickens. A lack of data from Thailand, Russia, the Indian subcontinent, Southeast Asia and Sub-Saharan Africa makes it difficult to lay out a clear map of the spread of chickens in these areas; better description and genetic analysis of local breeds threatened by [[extinction]] may also help with research into this area.<ref name= CHOF/> Chicken bones from the [[Arauco Peninsula]] in [[Zona Sur|south-central Chile]] were radiocarbon dated as pre-Columbian, and DNA analysis suggested they were related to prehistoric populations in Polynesia.<ref name="Borrell 2007">{{cite journal |last1=Borrell |first1=Brendan |title=DNA reveals how the chicken crossed the sea |journal=Nature |date=June 1, 2007 |volume=447 |issue=7145 |pages=620–621 |doi=10.1038/447620b |pmid=17554271 |bibcode=2007Natur.447R.620B |s2cid=4418786 |doi-access=free }}</ref><ref name="Storey 2007">{{cite journal |last=Storey |first=A. A. |others= et al. |title=Radiocarbon and DNA evidence for a pre-Columbian introduction of Polynesian chickens to Chile |journal=Proceedings of the National Academy of Sciences |date=June 19, 2007 |volume=104 |issue=25 |pages=10335–10339 |doi=10.1073/pnas.0703993104 |pmid=17556540 |pmc=1965514 |bibcode=2007PNAS..10410335S |doi-access=free }}</ref> However, further study of the same bones cast doubt on the findings.<ref>{{cite journal |last=Gongora |first=Jaime |others= et al. |year=2008 |title=Indo-European and Asian origins for Chilean and Pacific chickens revealed by mtDNA |journal=PNAS |volume=105 |issue=30 |pages=10308–10313 |doi=10.1073/pnas.0801991105 |pmid=18663216 |pmc=2492461 |bibcode=2008PNAS..10510308G |doi-access=free }}</ref><ref name= Thomson14>{{cite journal |last=Thomson |first=Vicki A. 
|others= et al. |title=Using ancient DNA to study the origins and dispersal of ancestral Polynesian chickens across the Pacific |journal=Proceedings of the National Academy of Sciences |date=April 1, 2014 |volume=111 |issue=13 |pages=4826–4831 |doi=10.1073/pnas.1320412111 |pmid=24639505 |pmc=3977275 |bibcode=2014PNAS..111.4826T |doi-access=free }}</ref>