And I'm telling you that doesn't happen with snakes, in my experience with a decent sized group of animals. Why? First of all, snakes are no where near as trainable (aka "contitionable" if that's a word) as rats. They don't make the association. And even if they were trainable enough to make associations like that, moving them to feed wouldn't solve the problem because they would just associate being taken out of the enclosure with being fed.