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Biologists puzzled by sharp drop in Yellowstone NP central bison herd

Figuring out what’s happening with wildlife based on annual counts is not easy. So many factors affect where and when they travel, from predators to weather, habits to habitat.

So when Yellowstone National Park did its summer count of bison this year, it was somewhat surprising to see that although the animals suffered their second highest culling and killing since 2000 — 1,274 animals — it was the untargeted central herd that shrank substantially and not the northern herd, which is the main target of the bison removals.


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