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

https://daltonhpbq627.bearsfanteamshop.com/how-rodents-sneak-into-san-diego-rooflines

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