Ok, I understand that the tree lobster needs to be saved. But is the approach of poisoning an entire island so that all rats die really the right one? Rats can adapt well - it's possible they won't catch all the rats, but then the survivors will have an easier time with the weakened other animals afterward? Or the Noah's Ark experiment doesn't work and the other animals die out - what does the tree lobster get out of that?
In the end it always comes down to the same thing: whenever man tries to fix something, it can almost only get worse...