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

https://gregorylneu028.zenbloomer.com/posts/how-much-does-attic-decontamination-cost-in-escondido

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