I used suet for woodpeckers a peace cut 1 ½ x 1 ½ x 1". I bought the suet at the local feed store. I think what sealed the deal was a smaller trap. - He/she (not sure which) was able to jump over the trigger of the larger traps I use for coon and fox. I did tie the suet to the back of the trap (two door trap) and only opened one door. Good Luck and once you catch the little bugger - dont get your fingers too close- they are feisty! My larger traps I bait with sardines or cat food but have caught many cats - not sure whom they all belong too but wish they would keep them home. I have also caught several raccoon and wild mink. In the largest single door trap I caught 3 fox. I have never trapped a coyote but the fellow down the road harvest several each year. I am not fond of killing predators but I made the mistake of moving into their feeding grounds and enticed them by putting chicken and turkey on their plate. I try to deter instead of kill so I have strung allot of electric fence. The coop, pen and run are complete and pulsing right now, in the spring, I will start the perimeter of the field around the barn.