I have a gopher, how do I kill it?

We don`t have gophers here but we do have moles and voles. 3 methods used here are
1) Castor oil mixed with water and sprayed in the areas they burrow- more of a preventative
2) Juicyfruit gum handled with gloves and left in a covered tunnel- kills because the animal can`t pass it
3) Set a rat trap baited with peanut butter right at the animals hole, cover the trap and the hole with a shoebox or similar to make the trap appear to be subterranean and cover with bricks- if the tunnels are active this should get `em