Mice in a crawl space may reveal themselves through scratching sounds at night, droppings, chewed openings

https://reidtmmg514.urbanvellum.com/posts/how-to-pick-an-honest-san-diego-insulation-contractor

Mice in a crawl space may reveal themselves through scratching sounds at night, droppings, chewed openings, nesting material, or even unusual pet attention.