Bison have made a comeback to Banff National Park in Alberta Canada and the final journey was by helicopter.
16 bison were re-located from one area of Alberta to Banff National Park in a huge logistical and conservation effort to return a wild herd to an area that has not seen the animals for more than a century.
Conservationists and visitors to the park will once again be able to see these animals in their natural state, and biologists will monitor the herd's movements using radio collars.
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