And cane toads in an ecological sense aren't even all that bad. In Australia - they are. In their native country, they are actually not even common.
I agree with mattmc, they aren't ugly, their eyes are stunning. A gold that looks worth millions! They're only ugly because society in Australia says they are bad and bad = ugly.
But they can be beautiful in their own country, in Australia I kill cane toads, but do it humanely. Would you go and torture the people who brought them to Australia? The toads didn't organise the trip themselves...