European bison released into UK wild following 6,000 year hiatus | USA TODAY

Two wildlife conservation organizations released European bison into the wild as a part of a climate change project and increasing biodiversity.
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The European bison went extinct in the prehistoric U.K. after "we lost our land bridge to Europe around 12,000 years ago," Paul Hadaway, director of conservation at Kent Wildlife, said. In Europe, the bison "hung on until almost becoming extinct" after World War I, he said.

The bison is Europe's largest land mammal and weighs up to a ton. They weigh less than American bison but are slightly taller.

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