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I think you're quite wrong about overwhelming herds. I mean, if humans didn't exist, it's not like deer and kangaroos would take over the world, is it?
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It's not so much that as it's they have collected in large groups in small areas. They won't migrate en masse, and because of the exceptional conditions of the areas they are reproducing much faster. The problem is, there are so damn many and they aren't evenly distributed enough, so they quickly exhaust their food supply and many end up starving to death over the winter. You'd think this would help in shaving down the numbers, but it doesn't. It's pretty much just an ongoing cycle of a surplus population of deer dying slowly and painfully and taking a little more of their food supply with them each time it comes full circle.