same as CF posted. I've 'moved' snappers before while catching them on a stick to help a guy that was studying entymology. He was looking for mite critters to complete his collection that he would look for them in the shell 'scales' or whatever.
Be careful, though. A stout stick and they snap and bite it and hang on. Don't get your hand anywhere near the place it grabs the pole or stick. Always keep an eye on it while it's hanging on and if it should drop loose, be prepared to keep your distance or it could take a good snap at you.