I just did a quick search (Shou Dou Qi), one source claimed that the elephant can also kill the mouse ie they're of equal value in respect to each other, I'm sure this is wrong and that the mouse always wins, another question is whether or not a mouse can eat another mouse from the lake, I think not but I dont remember the situation being covered in the rules in my set, all online sources I looked at say the lions and tigers can make both long and short leaps.