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

https://landenmuog401.theburnward.com/why-you-should-never-vacuum-rodent-droppings-in-your-attic-1

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.