As MAXUM said, let the hunters do it for free.
All you need to do is make it open season with no limit and you will see the problem drop off FAST!
And if you want them to be gone like right now, have the state put a bounty on them like a $1 a head and the state will dispose of the remains and it will be done faster than you can load your gun and draw a bead,,,
Its only a problem because the politicians are too busy drafting the next set on no rafting zones,,, Oh sorry, falling off topic,,,