AP photo
Bison walk towards the corral during the bison roundup at the The Nature Conservancy's Tallgrass Prairie Preserve in Pawhuska, Okla. Nov. 13. The bison, which once numbered about 30 million on the prairie, came dangerously close to being wiped off the map. Through conservation efforts like the tallgrass prairie preserve, the bison now number around 500,000 and are no longer in danger of extinction.
Read the article: Bison herds increase on prairie
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