How to Diagnose Animal Holes in Your Yard

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An extensive guide to solving the question: Which animal made this hole?
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Having trouble with mysterious burrows in your garden? Burrowing animals can be bothersome when they get busy digging, but finding the culprit is the first step. First, examine the hole—if you can see its end, it's not a burrow, and the creature that dug it probably isn't living on your land (and won't be a problem going forward!). If it doesn't, keep reading. Below, we'll cover exactly what you need to observe about the burrow to identify the animal, plus in-depth descriptions of the most common animal burrows. Sorry little critters, but we’re onto you.

Things You Should Know

  • Consider your region and geographic location to narrow down the possible native species, and eliminate any animals that aren’t present in your area.
  • Measure the mouth of the burrow and take note of the shape of the dirt around the hole to get a good idea of the size and digging practices of the animal.
  • Contact your local animal control or university extension office for additional help in identifying and containing or removing the animal in question.
Method 1
Method 1 of 2:

Examining a Burrow

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  1. Start your search broadly and narrow it down by first considering which burrowing animals are present in your area. You can eliminate any animals only found in regions outside your own. Search the internet for “Burrowing animals in [your region]” or call your local agricultural commissioner or animal control center to research this. [1]
    • Though many common burrowing animals are present all over (and as such, might be hard to narrow down by location alone), a little research can still go a long way when deciding between two potential culprits.
  2. Different animals make different sized holes, and the size of the hole will give you a good idea about what size animal you’re dealing with. [2] Use a tape measure to measure from one edge of the hole to the opposite edge, and wear sturdy garden gloves in case the animal is still present.
    • For example, if you find the hole is very small, say about the width of your finger, you can rule out larger mammals like groundhogs or raccoons, which wouldn’t fit inside.
    • In general, smaller animals (like squirrels) burrow in holes 3 in (7.6 cm) and smaller, whereas medium animals will be around 3–12 in (7.6–30.5 cm).
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  3. Another great indicator is the dirt around the hole, or more specifically the structure, pattern, or placement of the dirt. Different animals tend to have different methods when it comes to disposing of excess soil. [3] Search for piled dirt in unusual places, like on flat areas, or trails of flattened foliage that might lead to a hole.
    • Mounds come in many shapes. Some resemble small volcanoes with holes in the center, others are u-shaped, and still others are shaped like small chimneys or towers.
  4. Just like humans, animals all have their own preferences about where to build their homes. Some like to build near water, while others like to cozy up to man-made structures for extra protection against the elements. Consider where the hole was dug to further narrow down your suspects. [4]
    • For example, if a hole is on the side of a riverbank, you’re likely dealing with a semi-aquatic animal like a crayfish.
  5. There are a great many professional resources available, and if you're stuck or unsure, seeking professional help is often the best course of action. Plus, they can give you expert advice on wild animal removal if that's your ultimate goal. Ring your local animal control, or look up the extension office of your local university to ask for help. [5]
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Method 2
Method 2 of 2:

Common Burrows

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  1. While these 3 are, in fact, distinct animals , their burrows are largely the same. All of them build extensive networks which can host thousands of animals, so look for devastated local plant life and large swathes of dirt. [6]
    • Geography: All of the United States and Canada.
    • Hole size: 8–12 in (20–30 cm). Gopher holes are often bean-shaped.
    • Soil: Mounds of dirt and rocks around the hole.
    • Location: Meadows and prairies. Groundhogs also dig near gardens or barns.
  2. Often called “13-lined ground squirrels," these critters create distinct burrows. Look for their distinct white markings, multiple burrow entrances, produce damage, unearthed plants, and snapped shoots of young plants.
    • Geography: North/central United States and Canada, only at elevations above 6,000 feet (1,800 m) [7]
    • Hole size: 2 in (5.1 cm)
    • Soil: No mounds.
    • Location: Near or beneath logs, rocks, or other structures
  3. These mammals also prefer to dig as they forage for food. Look for fresh sod that's stripped or rolled away, as that means you might have a skunk or raccoon on your hands. [8]
    • Geography: United States, Canada, South America
    • Hole size: 3–4 in (7.6–10.2 cm), cone-shaped
    • Soil: No mound, but there may be disturbed earth, such as shallow holes or unearthed plant roots..
    • Location: Lawns and gardens
  4. Mole burrows often cause a good deal of damage while searching for grubs or earthworms, so check for destruction of plant roots and garden as well.
    • Geography: North America, Europe, and other temperate regions like Japan and Taiwan
    • Hole size: 1 ft (0.30 m)
    • Soil: Cone-shaped mounds, raised and wandering ridges
    • Location: Lawns and gardens
  5. If you think you might be dealing with a vole, look for burrows with multiple entrances and “runways,” or partially dug paths that they take to get from their burrow to their favorite food sources. Vole burrows are often accompanied by telltale gnaw marks on nearby trees or other foliage.
    • Geography: North America, Mexico, British Isles, Asia
    • Hole size: 1 in (2.5 cm)
    • Soil: No mound, but there may be narrow, recessed pathways leading to the hole.
    • Location: Beneath shrubs or in gardens
  6. If you've got chipmunks living nearby foraging for seeds and nuts, you'll hear their shrill calls, so listen close. In additional to their cries, check for damage to tender-stalked plants like flowers or other ornamental plants. [9]
    • Geography: North America, Mexico
    • Hole size: 2 inches (5.1 cm)
    • Soil: Mounds or loose soil
    • Location: Under or near log piles, stumps, buildings
  7. Armadillos are best known for digging holes to reach tasty insects, but they also make burrows to live in. In addition, they’re known to roll back new sod, so keep an eye out for signs of this in your yard. [10]
    • Geography: North, Central, and South America, Australia
    • Hole size: 7–8 in (18–20 cm) wide, 15 ft (4.6 m) deep.
    • Soil: Disturbed soil, plowed furrows
    • Location: Lawns, gardens, flower beds
  8. Rats can make a home almost anywhere, but are also known to burrow in the wild. Look for damage to personal goods or food stores, as well as damage to wooden structures. [11]
    • Geography: Universal
    • Hole size: 2–3 in (5.1–7.6 cm)
    • Soil: Worn or flattened ground in front of the entrance where the rats come and go frequently.
    • Location: Almost anywhere
  9. Many varieties of bees and wasps live underground in the adult stages of their life cycles. Cicada killer burrows are often accompanied by small furrows in the dirt where the wasp dragged a cicada into the hole, so be on the lookout for these. [12]
    • Geography: Eastern United States and Tasmania (cicada killers), Universal (bees)
    • Hole size: 0.25–1 in (0.64–2.54 cm)
    • Soil: 2 in (5.1 cm) mounds or u-shaped deposits around holes. Cicada killer holes often feature small paths into the hole.
    • Location: Areas of sparse vegetation or low grass
  10. Perhaps the most distinctive burrow on this list, look for small mud stacks, or “chimneys,” that lead to creek beds. This is a sure sign of a crayfish burrow. [13]
    • Geography: North America, Europe, East Asia
    • Hole size: 1 in (2.5 cm)
    • Soil: Tower created from balled mud that rises 2–4 in (5.1–10.2 cm) from the soil
    • Location: Near creeks
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Expert Q&A

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  • Question
    Should I get rid of the Cicada Killers in my yard?
    Chris Parker
    Pest Control Specialist
    Chris Parker is the Founder of Parker Eco Pest Control, a sustainable pest control service in Seattle, Washington. Since 2016, Chris has been specializing in Integrated Pest Management and doesn’t use any chemicals for pest removal. He offers removal services for ants, rodents, fleas, spiders, wasps, and more. Chris is a certified Commercial Pesticide Applicator in Washington State and received his bachelor’s from the University of Washington.
    Chris Parker
    Pest Control Specialist
    Expert Answer
    Cicada killers, or ground digger wasps, are incredibly beneficial creatures. They're not aggressive and don't defend their nests. They're like mud dauber wasps, they're just there and going about their business. They may be digging holes in your lawn, and that may annoy you, but those holes are beneficial for aerating your soil. However, if you're bothered by them buzzing around your yard or garden, a simple solution is by effectively watering your lawn. That's often enough to persuade them to relocate. 
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  • Question
    How can I prevent these burrowing animals from entering our house?
    Chris Parker
    Pest Control Specialist
    Chris Parker is the Founder of Parker Eco Pest Control, a sustainable pest control service in Seattle, Washington. Since 2016, Chris has been specializing in Integrated Pest Management and doesn’t use any chemicals for pest removal. He offers removal services for ants, rodents, fleas, spiders, wasps, and more. Chris is a certified Commercial Pesticide Applicator in Washington State and received his bachelor’s from the University of Washington.
    Chris Parker
    Pest Control Specialist
    Expert Answer
    Seal all cracks and gaps around your home to prevent animals and pests from entering. Inspect the exterior of your house, and pay a close attention to areas around windows, doors, vents, and the foundation. Use caulk or weather stripping to close any openings you find. Remember to always check and maintain these seals to ensure that they remain intact and effective to prevent unwanted animals or pests from entering your home.
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      Warnings

      • Removal methods vary widely from animal to animal, or removal may even be illegal in your area. The best way to handle a burrowing pest is to contact a professional. Consult your local animal control, agricultural commissioner, or university extension office for help.
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      • Many animals on this list can be aggressive or carry diseases such as rabies. Always use sturdy garden gloves when investigating, and be mindful of an agitated animal when approaching its den.
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      References

      1. ↑ https://www.walterreeves.com/insects-and-animals/diagnosing-holes-in-the-yard/
      2. ↑ https://www.walterreeves.com/insects-and-animals/diagnosing-holes-in-the-yard/
      3. ↑ https://henderson.ces.ncsu.edu/2020/07/holes-in-the-yard/
      4. ↑ https://henderson.ces.ncsu.edu/2020/07/holes-in-the-yard/
      5. ↑ https://www.walterreeves.com/insects-and-animals/diagnosing-holes-in-the-yard/
      6. ↑ https://education.nationalgeographic.org/resource/burrow
      7. ↑ https://extension.colostate.edu/topic-areas/natural-resources/burrowing-animals-determining-species-by-burrows-damage-6-521/
      8. ↑ https://hgic.clemson.edu/factsheet/holes-in-the-lawn/
      9. ↑ https://www.britannica.com/animal/chipmunk
      1. ↑ https://hgic.clemson.edu/factsheet/holes-in-the-lawn/
      2. ↑ https://www.britannica.com/animal/rat
      3. ↑ https://hgic.clemson.edu/factsheet/holes-in-the-lawn/
      4. ↑ https://hgic.clemson.edu/factsheet/holes-in-the-lawn/

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