High-frequency bird repellent devices are effective at driving away birds, which is their intended purpose. However, these devices also tend to have unintended negative consequences. For example, if you or your neighbors own pets, the high-pitched noise emitted by these electronic devices will cause them distress and may even make them aggressive.

Pest control and wildlife removal are different services. Pest control specialists typically handle insects and bugs, often using chemicals and poisonous sprays for extermination. Wildlife removal professionals, on the other hand, focus on larger animals. They prioritize humane methods like trapping and relocation, using poison only as a last resort. For insect problems, contact a pest control professional; for issues with other animals, an animal or wildlife removal specialist is the correct choice.

DIY treatments may help minor issues, but professionals provide long-term solutions and prevent recurrence.

It can be difficult to know what type of animal is in your attic until you see it. But several clues can help you narrow down the suspects:

• Sounds: Smaller animals like rats and mice make scurrying and tapping/gnawing sounds. Larger animals like raccoons and opossums make louder clambering noises. Also, note when animals are noisy: Squirrels are active during the day, while rats are busiest at night.

• Droppings: Rats and mice leave small, rice-shaped droppings (the rat’s version is significantly larger). Bigger droppings belong to larger critters like raccoons. As long as you’re not squeamish, an image search can help you identify what you’re seeing in your attic.

When in doubt, take photos of damage or other evidence and show them to an experienced pest control pro.