Rats are usually of the Norwegion(sp?) breed.....From what I have heard. I haven't looked it up though.
Eagles may soar, but weasels don't get sucked into jet engines "Give a man a fish, and you'll feed him for a day; give him a religion................ and he'll starve to death while praying for a fish."
I started my feeder colony with fancy mice of the natural colors(doesn't make sense does it?). So that the bird recognizes it as a normal food source. The unnatural looking ones, piebald and such, get cut up for tidbits.