Squirrels themselves tend to be less visible than other pest species since they like to live in areas out of sight of people. But there are number of signs to watch for. These include:
Scratching or rustling sounds in the walls or attic – Squirrels typically nest in these areas and are most active in the mornings and evenings.
Lots of squirrels around outside – These animals are abundant in most places, but if they’re nesting in your building you’ll see even more of them than usual.
Chewing damage – Squirrels chew siding, vents, insulation, wires, and more. You may find this damage both inside and outside of a property.
Squirrel droppings – Squirrel feces can look very similar to other animals, like mice and rats. But if you find any of these kind of droppings, pest control is probably needed.
In general, squirrels tend to prefer higher-up areas in buildings, like attics, where they can easily access nearby trees. If you suspect squirrels are in your building, checking up there is a good idea, as is checking your HVAC and any water pipes that may be up there for evidence of chewing.