If you had to pick who would win in a fight between a cute little mouse and a venomous scorpion, you'd pick scorpion, right? Musides / en.wikipedia.org Matthew and Ashlee Rowe Nope. It turns out grasshopper mice have evolved to resist bark scorpion venom. Matthew and Ashlee Rowe No matter how much it hurts, pain is actually pretty useful, so evolving to ignore it is rare. The mice can't even feel the scorpion's sting. Matthew and Ashlee Rowe The venom seems to stop certain neurons firing so grasshopper mice don't feel pain from the sting, even though other species like house mice do. Which makes them fearless when it comes to attacking. Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF Science/AAAS Grasshopper mice also appear to have an amino acid that binds to the toxin in the scorpion's venom, stopping it fitting into the mouse's pain receptors. So it stops them feeling any pain at all for a little while, too. You can watch the full video here. scim.ag And the paper is published in the journal Science today.