You can find a variety of humane bird repellent sprays online and at home improvement stores. However, if you want to try a DIY method that will keep birds away without harming them, mix some water, dish soap, and a few drops of peppermint oil and spray the area you want bird-free. Peppermint oil is a notoriously lovely smell for humans, but birds tend to avoid it.

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.

Yes, predator decoys work to keep birds away, at least temporarily. However, if the decoy remains motionless in the same spot for a long enough time, the birds will eventually wise up and realize it's a fake. Keep changing the location of the predator decoy to ensure that the birds keep their guard up and maintain their distance.

A treatment from a pest control service can last anywhere from 3 to 6 months, depending on the type of treatment, what pest it’s treating, and what environment you live in. This is why pest control service companies often offer packages where they come out multiple times a year to apply treatment to the outside or inside of your home.