Depends on the size of the animal. The invasive hippos in Colombia (yes, it's real) can easily be exterminated anytime the Colombians want. But I don't think

Depends on the size of the animal. The invasive hippos in Colombia (yes, it's real) can easily be exterminated anytime the Colombians want. But I don't think there is any chance of removing the House Sparrow from America.