They have done shit sample studies of deer v moa, and they showed a differing diet with moa being more generalists and deer being more specialist ie eating more of fewer varieties.
However pretty much everything that deer eat Moa also ate so all the species evolved with some grazing pressure and hence can sustain a certain amount of grazing. This is all pretty established science and pretty solid. However it gets squirelly when they start talking about how much pressure is sustainable and the differing effects deer have on our flora makeup.
The forest definately doesnt look the same today as it did in moa's time but we are as much to blame for that as deer are, and even if we remove the deer the forests still wont look like they did when moa roamed. So if we are going to have altered forests either way, surely having altered forests with deer running around for hundreds of thousands of us to utilise as a resource, food and past time is the better option.
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