Grasshopper mouse
The three species in this genus of New World mice are only distantly related to the common house mouse, Mus musculus.It is a carnivorous rodent, dining on insects (such as grasshoppers), worms, spiders, centipedes, mantis, scorpions, snakes, and even other mice.The grasshopper mouse survives in the deserts of southwest United States by feeding on the bark scorpion, which are plentiful, due to other resources being less common.[6] Researchers now know that the grasshopper mouse barely notices the intensifying sting due to a mutation in the cellular pathway that controls their pain response.This change prevents the mouse from processing Na+ currents when injected with the scorpion's venom, which blocks action potential propagation and induces analgesia.