Critter has a burrow in my veggie garden. How do I humanely evict it?

I have a ground hog, mole or skunk (maybe a raccoon but I don't think they have under ground burrows) that is eating my lettuce, spinach and greens. It's taunting my large tom cat by pooping in his favorite places (eww!) and they're huge & smelly. So whatever it is, it's probably bigger than 18 lbs (the size of my cat). What should I do?
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