Swamp is large enough as is. They wouldn't need to expand it at all, in fact they could reduce the amount of slimes which spawn because we have the northern wilderness now and even the new cave which has a bunch of spawns.
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But gators are like long, and big, so fitting a creature like that in would be annoying, i think it would be unfair to give a bounty to an animal that only spawns in one place anyway.