If youre heading up in size, might not work too well. I read just this week on this forum that bigger prey can be intimidating. Medium small rats scare the crap out of 2 of my BPs. I have to get small smalls.
Not sure why these rats would scare him. They are eyes closed rat pups. I had heard about them getting scared of the food. Thats why I tried a small mouse today to get him feeding again.