Sealing your eaves is key to a rat-free attic because roof-line gaps

https://travisphgy109.quillnesty.com/posts/why-san-diego-s-climate-makes-roof-rat-proofing-a-year-round-job-4

Sealing your eaves is key to a rat-free attic because roof-line gaps and attic vent openings should be screened with corrosion-proof mesh and properly sealed to block access.