Pest control in Illinois follows the seasons harder than it follows a slogan. Mice move in when the heat starts and the fields are cut. Ants show up with the first warm kitchen. Wasps build in gables and under porch roofs by early summer. Southern counties add termites to sill plates and to any wood that touches damp soil. What you saw, and where, matters more than a name you are unsure of.
A scratch in the attic at night may be a mouse, a squirrel, or a raccoon, and those are not the same opening. Look for droppings, a greasy rub mark, a torn soffit, or a gutter guard pulled up. Carpenter ants in wet fascia mean the wood is already soft. Cluster flies and lady beetles in a sunny upstairs are a fall invasion, not a dirty kitchen. Say which floor you meet them on.
Town houses and farmhouses feed different pests. Grain, feed, and a barn door left lit will keep rodents close even after the kitchen is clean. A brick crawl space that stays damp will keep ants and wood insects active long after a treatment. Moisture is part of the complaint. If you have seen wings, say wings. If you have only seen frass that looks like sawdust, say that instead of guessing termites.
Tell the call what the building is: frame farmhouse, brick two-story, a split-level on a slab, a house with a crawl space. Entry points are usually at the rim, the garage sweep, the dryer vent, and gaps where piping leaves. Pets and children live in the house, so say that before any talk of baits. If you already plugged one hole and they returned, say which hole. A return means another opening, not a failed story.
Lead with the pest you think it is, the room, and whether the activity is day or night. Illinois gives mice a long reason to be indoors and insects a humid summer to exploit. Do not wait for a second season of droppings. Call the number on this page.