Rodents often get under San Diego homes through torn crawl-space covers, open vents, gaps under doors, loose flashing

https://daltonigkp839.greyhavendaily.com/posts/why-sealing-your-eaves-is-the-secret-to-a-rat-free-attic-in-san-diego-2

Rodents often get under San Diego homes through torn crawl-space covers, open vents, gaps under doors, loose flashing, and openings where utility or A/C lines enter exterior walls.