The milk story came from milk snakes. The tale is that farmers saw snakes on their cows utters and that's how they got their name. Milk Snake, but snakes do not eat or drink milk at all. I never heard any rumors about corn snakes taking milk, so i dunno where you got that one from, but the trust is mice/rodents is all they need. Nothing else. Mice have better nutritional value compared to the other rodents. If you check out rodentpro on the web you can look up the prices and nutritional values. To compare. plus if you search these forums there's a thread that i posted the link for the comparison of rats vs. mice.