Mammals:
* Moles: These small, burrowing creatures create large, volcano-shaped mounds with a central hole. They are looking for earthworms and grubs.
* Voles: Similar to mice, voles create smaller, flatter mounds with a tunnel entrance. They feed on roots, bulbs, and plants.
* Groundhogs (Woodchucks): These large rodents make large, dirt mounds near their burrows. They are herbivores and eat a variety of plants.
* Rabbits: Rabbits can dig shallow burrows and leave piles of dirt. They are herbivores and feed on grasses and other plants.
Insects:
* Ants: Some ant species build mounds of dirt above their nests. These mounds are typically small and may have multiple entrances.
Other possibilities:
* Birds: Birds sometimes scratch up the lawn while looking for food. This can leave small, scattered mounds.
* Roots: Tree roots can grow and push up the soil, creating mounds.
To determine the culprit:
* Observe the mounds: Look for clues like size, shape, entrance holes, and any other signs of activity.
* Check for tracks: Animal tracks can help identify the culprit.
* Set traps: If you suspect rodents, set traps to catch the culprit.
* Contact a pest control professional: They can help identify the animal and recommend solutions.
Once you know what is making the mounds, you can take steps to deter or control the animal.