The scorpions' venom, which can normally kill small animals by inflicting neurological damage, doesn't seem to have any effect on the mice. In fact, the mouse is immune to all six of the toxins ...

Ears back and eyes closed, a Mearns' grasshopper mouse attacks a striped bark scorpion. This image relates to a paper that appeared in the 25 Oct., 2013, issue of Science, published by AAAS.