How do you identify the animal digging beneath a shed before acting?

You walk out to the back garden on a pleasant Saturday morning, coffee mug in hand, and notice a fresh pile of dark soil spilling out from beneath the wooden floorboards of your garden shed. Your heart sinks a little because you know something has moved in without paying rent. The immediate temptation is to grab a shovel, stuff the hole with whatever scrap metal is lying around, or pour a bottle of strong chemical down there to send a message.

Hitting fast-forward on pest control before you even know who your underground tenant is can backfire in a hurry. If you seal that opening while a mother woodchuck or skunk is out foraging, you might trap dependent young underneath the floorboards. That leads to a very unpleasant decomposition odor, buzzing flies, and an agitated adult tearing up your garden trim trying to claw its way back to its litter. Worse yet, guessing the wrong animal means you might build the wrong size barrier or use a repellent that completely ignores the habits of the actual creature living there.

Identification has to come before action. Wildlife experts rely on a structured monitoring phase before deploying any physical exclusions or traps. Think of it like checking if anyone is actually home before you change the locks on a house. You need to look at the size of the entrance, inspect the tracks left behind in the dirt, and check for scat, which is just a polite word for animal droppings. Only when you have gathered these clues can you make a smart, humane choice that solves the problem permanently.

Figuring out who is digging beneath your shed usually comes down to measuring physical clues and reading the signs left in the dirt. Start with the burrow opening itself. A large, clean, circular hole measuring about 10 to 12 inches across, usually with a hefty mound of excavated subsoil sitting outside, usually points to a woodchuck or groundhog. If the hole is a bit smaller, around 6 to 8 inches across, and lacks a massive dirt pile because the animal prefers taking over pre-existing cavities, you are usually dealing with a striped skunk.

For smaller, clustered holes measuring just 2 to 3 inches wide right along the bottom edge of the shed skids, look closely for greasy smudge marks on the wood. Those typically belong to Norway rats, which can squeeze through surprisingly tiny gaps. If you see wide, elliptically shaped tunnels with deep claw gouges scraped into the walls, an American badger might have moved in. Armadillos also leave clean, round entrances around 7 or 8 inches wide, often accompanied by shallow cone-shaped foraging pits poked into your nearby lawn turf.

Since you rarely catch these animals in the act, you can set up a simple check using animal movement indicators. Crumple up a single sheet of newspaper and wedge it loosely into the burrow entrance, or cross two light wooden sticks right across the hole. To capture crisp footprints, lightly dust a 1 to 2 foot patch of plain white baking flour across the smooth ground directly outside the threshold, much like a baker dusting a countertop before rolling out dough. Leave these indicators alone for three consecutive days of clear weather. If the newspaper stays put and the flour shows no new footprints, the burrow is usually vacant and safe to approach.

Once you finish your three-day check and know for certain that the burrow is empty, your next smart move is putting in a permanent underground barrier so a new squatter does not take over. Just catching and moving the animal somewhere else rarely solves the problem for long because an empty space beneath a warm shed is prime real estate. If the yard still has plenty of grubs and clover, and the gap remains wide open, a new critter will likely move in within a couple of weeks.

To stop digging mammals for good, standard practice calls for burying an L-shaped apron made of heavy wire mesh. You will need to dig a trench about 12 inches deep all the way around the base of your shed. Fasten galvanized steel mesh tightly against the bottom of the shed wall, and then bend the lower 12 inches of that wire outward to form a flat underground shelf before you shovel the dirt back in. When a determined animal tries to dig straight down right next to the wall, its claws hit that horizontal wire shelf, which ruins its angle of attack and stops the digging entirely.

If you stumble upon animal waste or a shared droppings pile near the shed, handle it with caution. Fresh roundworm eggs shed by raccoons take roughly 2 to 4 weeks in the dirt to turn infectious, so cleaning them up promptly is a good idea. Slip on disposable gloves and a dust mask, spray the droppings lightly with water so you do not breathe in dust, and shovel them into trash bags for disposal. Never pour standard household bleach over wild animal droppings hoping to sanitize them because bleach has no effect on those particular parasite eggs. Only extreme heat, like boiling water poured safely onto a hard surface, destroys them on contact.

There are times when handling a wildlife problem yourself is no longer wise, and you need to call a licensed nuisance wildlife control operator or check with local public health authorities. If you find a large accumulation of waste in a tight, poorly ventilated crawl space, the microscopic parasite risks mean you need proper respiratory protection and commercial cleaning gear that rarely sits in a standard home garage.

Call an expert right away if an animal looks cornered or stuck in a narrow structural void, or if you spot any wildlife acting strangely. That includes unprovoked aggression, daytime staggering, confusion, or other signs that could point to rabies or canine distemper. Never try to capture or touch a wild animal that might be sick.

Keep an eye on local wildlife laws and seasonal rules too. During the spring and summer breeding seasons, state and provincial wildlife agencies often limit or ban certain exclusions and removals to protect helpless young animals. If you live somewhere with strict rules about handling local wildlife, or if the soil has shifted and cracked your shed foundation, a qualified local professional can handle the red tape and secure your building without breaking the law.