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Tree sap is not usually dangerous to humans or pets. But some trees do produce dangerous sap. Notably, ash, birch, cedar and similar saps can irritate the skin but aren’t dangerous. Sap from trees like the Brazilwood, Mahogany, Milky Mangrove or well-named Poison Walnut can be corrosive, cause nausea, or trigger those with asthma. But for most backyard trees, protective equipment like a sturdy pair of gloves should be fine.

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, it is generally safe to return to your house once the pest control professionals have granted permission. Keep in mind that you’ll only need to evacuate your home during extreme pest control treatments, such as whole-home fumigation, while more minor treatments don’t require leaving. When you return home, be sure to follow the pest pro’s instructions carefully, especially those surrounding wait times and safety precautions.

Brown recluse spiders are found in Midwestern and South Central states like Nebraska, Ohio, Texas, and Georgia. While it’s possible to find spiders from the same genus elsewhere in the country, you’re unlikely to find a brown recluse infestation outside of these designated zones. In any case, there are other dangerous spider species across the U.S., so always use caution when dealing with infestations of any kind.