I tried a cool technique yesterday. It's where you slide in another rodent when your snake is taking the final gulps of the first.

I had two mice and three bp's. One wouldn't take it, the other only eats frozen thawed. So I needed to give Goldy two, wasn't sure if she'd strike and eat a second. So I killed it and as soon as she was taking the final gulps I slid it in. She just kept going. It was awsome.