You do not always see the animal. Here are ten signs that something has moved in.

Sounds and smells

Scratching, thumping or squeaking; a musty or ammonia smell; a rotting smell that gets worse.

Signs you can see

Droppings, stained ceilings, torn insulation, chewed wires or trim and nesting material.

Signs outside

Holes at the roof edge, damaged vents, droppings at the base of the chimney, tracks and overturned trash.