Wildlife in Crawlspace and Attic: Identification and Humane Solutions

Hearing rustling or unusual sounds under your house or in the attic can be unsettling. Common culprits include raccoons, opossums, squirrels, rats, and mice—each capable of entering through surprisingly small openings (raccoons need only 4 inches, gray squirrels 3 inches, rats 1 inch, mice 3/8 inch).

Why Repellents and DIY Trapping Often Fail

Cat urine, mothballs, and ultrasonic devices are largely ineffective. Cage traps marketed as "humane" can cause stress, injury, or death if not monitored properly. Relocation is often illegal and inhumane, as displaced animals struggle to survive in unfamiliar territory.

Proper Inspection and Exclusion

For accurate identification and effective, research-based solutions, visit the Internet Center for Wildlife Damage Management (icwdm.org). The site offers detailed inspection techniques, including the "paper-hole technique" to determine if an entry is active, and guidance on exclusion methods that prevent re-entry without harming animals.

Addressing Squirrels in the Attic

If young are present, wait until they are mobile before installing one-way doors or trapping. Seal entry points only after confirming the space is vacant. Professional wildlife control operators can ensure the job is done legally and humanely.