[FS]

I don't think so. No species of animal gangs up on another species to kill it, or kills them on a mass scale. In nature, animals live and hunt in small groups or alone. Once you've acquired sentience, it actually doesn't take much effort to cause great change - or damage - to nature.

However, I'm not so sure if that would be the case with an endangered species. I think that the disappearance of a species of already a low count would not have a very significant impact on the ecosystem they live in.

That's not to say that I don't find it a great pity when a species of animal vanishes, because they can't be brought back. Arguably, human interefence to preserve can be just as damaging as negative human interference, but not if people simply decide to withdraw and let nature handle itself.