Hey Teacher, sometimes coyotes do that around here. They can smell anything! Are they taking the trap as well?

I stake the traps with a 5-ft Fiberglas rod with a flag so I can see them above the grass. As a local gopher trapper told me, he thinks the predators might be keying in on the flags/poles and he might be right. Anyway, the traps are staked and while the gopher may be gone, I still have the trap.

Is there a good book to learn a little on moles and mole trapping? Any recommendations?