I really don't understand why some people have collections that won't take rats, but, will take ASFs and mice. I have about 30 snakes that are all on rats. Why is it that others have 5 snakes and can't get them all to take rats? My personal opion is that people are giving thier snakes the choice of what they want to eat, therefor, making it harder on themselves to find feeders for thier collections. The only time I have used a mouse was to get a picky eater to start eating and then quickly switched them over to rats. Post your insights on this.