Ancient bison skulls unearthed by flood show evolution story
PIERRE (AP) -- More than 100 bison skulls unearthed by the 2011 Missouri River flood are giving scientists more information about how the modern bison evolved.
The 101 skulls found in October by the U.S. Army Corps of Engineers date from 10,000-5,000 years ago and reveal the changing face -- and horns -- of the bison.
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