I asked one of the rangers I ran into about it, and the explanation I got was basically they're big and stubborn and if one of the lead animals gets the idea it wants to be somewhere, they'll all get there. They're neat animals, but you can really see how a bunch of motivated people with rifles could do the damage they did to the wild population.
Also not really wildlife, but I posted these in the other thread. Zion is just as cool.
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