Absolutely. I would extiguish entire species. What animal is going to be the next Ghandi, or cure cancer, or AIDS? What are they going to do other than flit here and there and be pretty to look at? I realize we are talking extremes here, but when it comes right down to it, I'm going to choose a human over a non-human, terrestrial, avian, or marine anytime.
I do find it funny that so many people lament the loss of life in wars and other conflict, but have no compunction whatsoever in letting humans suffer in the name of saving an obscure worm, bug, fish, bird or whatever that contributes nothing to earth. Of course there are plenty of humans that contribute nothing themselves, but I suppose that is a different discussion.
I now stand prepared for the excuses on why this moral relativism is to be allowed...