It was named as a UNESCO World Heritage Site in 1983 because of its biological diversity. The Peace-Athabasca Delta is one of the world's largest freshwater deltas, as well as having a population of wild bison.
Inside the park is the only natural nesting habitat for the endangered whooping crane. The park is also populated by moose, wood bison, black bear, wolf, lynx, beaver, brown bear, snowshoe hare, sandhill crane, ruffed grouse, and the world's northernmost population of red-sided garter snakes.
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