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When a wasp stings, it pushes its stinger into the skin and releases venom. The sting site will typically become inflamed and swollen and likely hurt quite a bit. 

Some people are allergic to the venom and can have serious allergic reactions to a wasp sting. This sting could cause the throat to swell, difficulty breathing, hives, rapid heart rate, and vomiting. If you or someone has an allergic reaction to a wasp sting, it’s important to call 911 for emergency treatment, as reactions can be life-threatening.

Common signs of a flea infestation include pets scratching or grooming excessively, itching and irritation affecting both pets and people, and visible flea bites or red spots on the skin. You might also see live fleas on your pets or find dark specks in their fur, known as 'flea dirt,' which is flea feces.

How often you need pest control depends on your infestation problem. If you have a one-off issue, such as a wasp nest in a high-traffic area, you shouldn't need regular service. However, if you live in an area prone to ticks, termites, and ants, you'll likely need at least an annual pest control service. If the problem is persistent and significant, you may need quarterly or monthly service.

Identifying the specific animal running on your roof at night can be challenging without direct observation. Common nocturnal roof visitors include raccoons, squirrels, opossums, and rats. Raccoons are bigger and can create heavy thumping sounds. Squirrels are agile and may produce rapid scurrying noises. Opossums tend to move stealthily with less noise. Rats can make scratching or gnawing sounds. To determine the culprit, look for signs like footprints, droppings, or damaged areas near the roof. For accurate identification, consult a pest control professional or set up wildlife cameras near potential entry points.