DSGB- My last cat was the same way! My new one hasn't figured out how to get up on the shelf to get at the mouse yet though! I hope it's a long time before she can jump that high!

On a side note, just because a mouse is destined to be snake food, that doesn't make it okay to let your other pets play with them. And definitely not a good idea to hold it in one hand and the snake in the other.