Hawaii imported the mongoose to deal with an overpopulation of sugarcane field rats. Forgot to factor in that mongoose sleep at night, and the rats during the day.
Result? Now too many of each. D'oh.
Here in Arkansas, the old timers say that Fish and Game brought back the beavers over the objections of everybody but the environmentalists. Not enough territory for the beavers to thrive, etc., etc., so they brought in alligators to control the beaver population. Turns out gators don’t really like beavers (cue up the off-color jokes) so now we have both overrunning us.
I know that some of the F&G people post here, so I’ll probably get flamed for this, but it’s what the natives say, ALMOST to a person.
First-hand, I will say that in my area, the only old-growth bamboo one finds are along river banks (to control erosion). That one is undeniable. I doubt it was F&G who introduced it, maybe the Corps, but it sure wasn’t private parties.