A number of years ago while managing an apricot orchard in the San Francisco Bay Area, I had a big problem with gophers. The control that worked best for me was to pay kids 25 cents per inch for gopher snakes they would catch, and release them down active burrows. Wether they ate the gophers or just scared them away, it seemed to work, and they certainly don't eat bulbs. Gary in Hilo, HI, where we do not have gophers or moles but do have a snake called locally the blind worm. It lives mostly underground, is parthenogenic (there are no males), gets about 6"/15cm long, and eats termites, ants, and other arthropods. I find them in my compost piles usually. They are wonderful!