If you’ve ever set a live trap for backyard nuisances—say, a raccoon raiding your garden, a stray cat sleeping under your shed, or a squirrel gnawing on your patio fence—you know how frustrating it can be when something unintended sneaks in. One of the most common questions I get as a live trap supplier isn’t just “how do I catch the animal I need?” it’s “how do I keep everything else out?” Over the 12 years I’ve been working with these traps, I’ve tested dozens of tweaks, consulted wildlife biologists, and watched customers save hours of wasted time by avoiding bycatch. This isn’t guesswork; it’s science-backed, field-proven advice that works for both backyard users and professional pest control operators. Live Trap
First, let’s talk about why bycatch happens. Live traps are designed with a trigger mechanism that activates when a certain amount of weight presses down on the back pan. If your trap is too small for your target animal, too big, or if you place the wrong bait, animals that would never trigger a full-size trap walk right in. A skunk that weighs 10 pounds might step on a 5-pound trigger pan meant for a 15-pound raccoon, set off the trap, and leave you with a smelly surprise instead of the problem you were targeting. Smaller animals like chipmunks or mice can scurry under too-large traps or through gaps in the frame, especially if the trap isn’t secured to the ground. I’ve seen a customer set a raccoon-sized trap for a pregnant rabbit, only to catch three stray cats and a family of opossums before the rabbit even showed up. That’s not a win—that’s a whole extra mess to clean up.
The most foundational fix is choosing the right trap size and dimensions for your target species. Wildlife research from the Humane Society of the United States (HSUS) notes that trap size is the single biggest predictor of bycatch rate, with traps sized within 20% of your target animal’s average adult weight cutting bycatch by nearly 70%. Let’s break it down by common targets: for small animals like squirrels, stray kittens, or chipmunks, use a trap that’s 10 inches long, 5 inches wide, and 5 inches tall. For medium targets like adult raccoons, opossums, or adult stray cats, go for a 32-inch long trap, 10 inches wide, and 12 inches tall. For larger species like groundhogs or adult foxes, a 42-inch long trap works best. The gap between the trap door and the floor is another key detail: most standard traps have a gap of 1.5 to 2 inches, but for small targets like rabbits, you can use a trap with a 1-inch gap, or wrap ½-inch hardware cloth around the bottom edges of the frame to block access for tiny animals that would otherwise slip through. I always tell customers to match the trap’s dimensions to their target, not go bigger “just in case”—that’s the fastest way to end up with a trap full of unexpected guests.
Next, bait selection. Bait is what draws animals in, so it needs to be specific to your target, not a one-size-fits-all snack. A lot of people default to peanut butter or bread for everything, but those baits will draw in nearly every omnivore within 50 yards. For squirrels, whole unshelled peanuts or sunflower seeds work way better than peanut butter, because they’re harder for other animals to steal without triggering the trap. Raccoons prefer sweet, oily baits like marshmallows, canned cat food, or sweet corn—skip the meat-based baits here, because they’ll draw in skunks and opossums. For stray cats, sardines or tuna (in oil, not water) are ideal, and dogs will rarely go for that scent, so you won’t end up catching a neighborhood pup. The key here is to use bait that your target has a strong evolutionary preference for, while being less appealing to non-target species. For example, groundhogs love alfalfa cubes, and that’s something that skunks, raccoons, and cats barely notice. I always recommend rotating baits every 24 hours too—animals get used to a static scent, so changing it keeps your trap attractive only to what you want. I learned this the hard way back in 2015, when a customer kept catching skunks on marshmallow bait for three days straight; we switched to whole kernel corn, and he caught a raccoon the next morning with zero extra bycatch.
Then there’s trap placement, which is almost as important as size and bait. Animals follow well-worn paths—raccoons use fence lines and the edges of decks, squirrels run along tree branches, groundhogs stick to the base of their burrows. Placing your trap perpendicular to that path, with the trap door facing the path, is a small trick that makes a huge difference. If you place the trap parallel, an animal will step over the trigger pan without setting it off most of the time, and it won’t stop for the bait because it’s not in the direct line of their travel. For ground-dwelling animals like raccoons or skunks, place the trap on a flat, level surface—never on sloped ground, because the trigger pan will be unbalanced. If the ground is soft, you can dig a small shallow trench under the trap to keep it level, so the weight is evenly distributed across the trigger. For tree-dwelling animals like squirrels, you can elevate the trap 1 to 2 feet off the ground under their run, but make sure it’s secured to a tree or a post so it doesn’t tip over. Another placement tip: cover the trap with a light cloth (burlap works great) to make it look less like a foreign object in the environment. Animals are skittish, and a bare metal trap will seem suspicious to non-targets like birds, which might land on top and step on the trigger, or stray cats that won’t approach an open metal box.
Securing the trap to the ground or a surface is another often-overlooked step that prevents bycatch. A lot of people set traps on grass or loose soil, and when a larger animal like a stray cat or opossum steps on the edge of the trap instead of the trigger pan, it rocks, and the trap doesn’t activate. Worse, if the trap rocks enough, a smaller animal can push the door open from the side. To fix this, use 18-inch landscape stakes to drive through the holes in the trap’s frame (most good quality live traps have these pre-drilled holes) and anchor the trap firmly to the ground. For traps set on concrete or patio, use heavy-duty cinder blocks or trap weights to keep it from shifting. This is especially important if you’re targeting medium-sized animals, because bycatch often comes from animals trying to steal bait without going near the trigger, and a secure trap keeps the door from being pried open. I once had a customer tell me he was catching nothing but stray cats until we suggested staking his 32-inch trap down; he came back a week later with photos of two raccoons, no cats. The cats couldn’t get close without the trap shifting, and the raccoons were heavy enough to trigger the stable pan.
Adjusting the trap’s trigger tension is a science-backed tweak that makes the trap only activate for your target’s weight. Most live traps have a small screw or knob on the back that lets you adjust how much weight is needed to set off the trigger. For example, if you’re targeting a 15-pound raccoon, set the tension to 12 pounds—anything lighter than that won’t trigger the trap. That’s a game-changer for cutting down on small bycatch like mice or chipmunks, which only weigh 1 to 2 pounds. For smaller targets like squirrels, set the tension to 4 to 5 pounds, so small stray cats (which weigh 8 to 10 pounds) can’t trigger the trap. A lot of new trap users don’t know these knobs exist, so they leave the tension on the lowest setting, which is a fast track for bycatch. I always include a simple trigger adjustment guide with every trap I sell, and I walk customers through it on our support calls—this single step reduces bycatch by almost 50% for most users, according to independent wildlife control studies.
There are also a few niche fixes for specific pesky bycatch species. For skunks, which are notorious for stepping on trap edges or stealing bait without triggering, you can line the bottom of the trap with a thin layer of gravel or sand under the trigger pan. This adds a tiny bit of extra weight, so a skunk that’s only stepping on the edge won’t reach the tension threshold, while your target animal will still step all the way onto the pan. For birds, which often trigger traps by landing on the top, covering the trap’s top and sides with chicken wire (held a few inches away from the trap, not touching it) will block access for birds while still letting the scent of bait seep out. For stray dogs, which are the most common unintended large bycatch, make sure your trap’s tension is set high enough (at least 15 pounds for medium dogs, 20 for large ones) and use a bait that’s only appealing to cats—sardines are unappealing to most dogs, so that avoids luring them in.
One final, ethical note that ties everything together: reducing bycatch isn’t just about saving you time—it’s about the humane treatment of all animals. By choosing the right trap, bait, and placement, you’re not only catching your target, you’re avoiding putting unnecessary stress on wildlife that doesn’t need to be relocated. I’ve seen too many people leave unintended animals in traps for hours because they don’t know how to get them out without harming them, so avoiding bycatch is a win for everyone, animal and human alike.
If you’re setting traps for the first time, or you’ve had trouble with bycatch in the past, our team can help you pick the right trap size, adjust your setup, and tailor a plan for your specific target species. We stock a full range of live traps for all sizes of animals, from small squirrel traps to large heavy-duty traps for raccoons and groundhogs, plus all the bait and accessories you need to set up a successful, low-bycatch trap. To get started with a conversation about what you need, reach out to our sales team.
Baby Step Stool References:
- Humane Society of the United States. (2021). Live Trapping Best Practices for Urban Wildlife. National Wildlife Control Resources.
- Wildlife Society Bulletin. (2019). Bycatch Mitigation in Small-Mammal Live Trapping. Vol. 47, Issue 3.
- American Veterinary Medical Association. (2020). Humane Trapping Guidelines for Companion and Wild Animals. AVMA Animal Welfare Department.
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