Pond Boss Forums GENERAL QUESTIONS Wildlife Management Mr. Gopher:

Those gopher traps that you slide down their hole work very well. The trick is to tie a string onto them, slide them down the hole, then cover the hole really well with a board. They come up the hole thinking they have to uncover the entrance and they walk right into the trap. If the opening is left uncovered, they see the trap and try to push it out of the hole, resulting in more misses.

This is the type that I've used.
http://www.google.com/products/catalog?q...ed=0CHEQ8gIwAA#