Carl Spackler could help:

"I have to laugh because Ive often asked myself my foe, my enemy, is an animal. In order to conquer him I have to think like an animal and whenever possible to look like one. Ive got to get inside this dudes pelt and crawl around for a few days. Who is the gophers ally? His friend? The harmless squirrel and the friendly rabbit. Im going to use you guys to do my dirty work for me."

http://www.carlspackler.com/sounds/135.mp3

But his methods might be extreme:

"Hello? Anybody home? Hello, Mr. Gopher! Its me, Mr. Squirrel. Just a harmless squirrel. Not a plastic explosive or anything. Nothing to be worried about. Im just here to make your last hours on earth as peaceful as possible. Dont mind this. This is doctors orders. You dont mind if I just pop in there for a few laughs? Thats right. Or in the words of Jean-Paul Sartre: Au revoir, gopher. This is going to be sweet."

http://www.carlspackler.com/sounds/156.mp3