DNA recovered from ancient caribou bones reveals a possible link between several small unique caribou herds and a massive volcanic eruption that blanketed much of the Alaskan Yukon territory in a thick layer of ash 1,000 years ago. It shows a link between the changes in local wildlife and the volcanic eruption also around the time aboriginal peoples switched from throwing spears to bow & arrows.
http://www.biologynews.net/archives/2010/02/22/ancient_dna_reveals_caribou_history_linked_to_volcanic_eruption.html
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