How many "snow white mice" live in nature? I suspect that this fact alone is enough to cause most animals to react. Also, if you noticed, that in the second pass with the mouse, the elephant didn't react until the mouse began to move.

So I see two things that would need to be done to rectify the faulty experiment.

1. Replace white mouse with a natural colored (brown) mouse.

2. Use something small (mouse-sized) and white with a remote control to see how the elephants react to that.

I believe that the elephants would not react to a brown mouse & I believe they would react to anything that was not something naturally occurring in nature.