The rats chew right through my rubber dustbins containing chicken and rabbit food. I try to cover every possible hole with cement or stainless steel wool. I’ve set traps with bait that smells like vanilla of Fanta Grape. I’ve also used buckets filled half way with water. You place them right under their route down. They fall in and drown. Need to move the bucket often.
The rats will eat anything – If they can not get into the animal food or your kitchen cupboard they tend to get less… or eat your baby rabbits. That is when you start mixing the Fanta Grape cooldrink with poison, if available.