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the reduction in grazing pressure from deer, and the fact that deer avoid wolves gives trees the chance to grow. Deer eat the shoots of trees, and so enable a more reach ecological system to be sustained.

Wolves do a better job of culling the sick deer (or cattle)

I’m sorry, are you trolling? I told you it had a positive effect on the whole ecosystem and that human hunters can’t replicate that (I won’t waste time describing this here just for you to ignore it, you can read it up)