I don't really know the answers to those questions. I just try to make sure there's a pinch point as far as entrance. Can only enter from one way. And I have tool from Fleming. Then I've used a couple of different baits from them. The cat had some duck wings with the bait
Your either very lucky or a natural. Congratulations. What do you do with your catches? I like seeing the pics, getting a little old to do the work that trapping takes. Plus I have no idea what to do with the animals.