I don't see this posted anywhere, but we live in San Dimas CA and have a HUGE problem with Rats! They are the Norway Roof Rats and they are meat eaters. We have had them break into the chicken coop, then open up a bird cage (with sliding doors), and take a baby peacock not only out of the bird cage, but then out of the chicken coop. The amount of cooperation that would have had to be involved in making this happen is crazy as it would take at least 2 rats to keep sliding metal doors open, etc… We had a giant cage with full grown Indian Ringneck Parrots (about 1 1/2 feet tall) and one of the sliding doors was not fastened securely enough (we have learned that each door has to have a ring or be wired shut) and in one night the rats broke in and killed and started eating the parrots (ate their feet and started with their chest). We have tried multiple types of traps and as much as I hate it, even poison. The only solution that has ever worked for us is when we rescued more cats. We also started cementing the aviary floors (we are an animal sanctuary and have 11 aviaries), but it takes a lot of time and is expensive. We have learned that any area where the rats can get their head in they can collapse their rib cage to enter through. They have chewed through any wooden doors so we have to be monitoring that always. I would love to know if anyone else has this kind of problem and what they have done. Thanks!