We have got rats in the garden like RAY mentioned. The bird seed falls through holes in the base of the feeder and they've even dug under the base to get at the seeds. As soon as I let the dogs out, Schnauzers which are bred for ratting in Germany, the rat(s) bolt under the fence into my neighbours.
My wife has two hutches with guinea pigs in one of our sheds and they've chewed a hole in the floor.
Because of the dogs I have to watch what I put down. I've put the blue pellets in the shed plus a normal trap baited with peanut butter.
I also bought a humane trap to catch them alive which I baited with peanut butter as recommended. If I do catch them in that there will be nothing humane about it, they will be going swimming in my pond while still in the trap.
There's only one problem with that plan, I've yet to catch one despite the bait being licked clean off the treddle. I've a feeling that could be mice or even birds like dunnocks though.
It's a bit annoying because if I had an air rifle I could shoot the buggers.
Still, I don't see why the birds should suffer so I carry on feeding them :O)