Cats are a really close second. I don't think there have been too many humans that have driven entire species to extinction. There have been a few cats that were allowed to exterminate multiple entire species. Don't get me wrong. I love the furry little psychopaths, but they are furry little psychopaths.
Embrace the paradox, humans are arguably the greatest rights violators in all forms of violence, but they are also the only beings capable of granting rights through moral agency. The paradox is also true of anthropocentric climate change, it's creator, but also it's only possible resolver. The environment only has instrumental value to conscious beings so it would miss the mark to assume the absence of humans is in anyone's (including animals) best interest.
Guess we should just try to get through each others thick skulls instead of being edgy :/
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