Grasshopper mice are a species of New World mice found in deserts throughout North America. They are small-to-medium sized, growing up to 13cm in size and weighing around 40-50g.
Despite their cute appearances, they are carnivorous, ferocious hunters. They feast on various insects, but are also known to hunt other mice.
Grasshopper mice have interesting adaptations that make them seem more like a miniature wolf or mongoose rather than a mouse. For example, they stalk their prey like a cat before pouncing. They hunt highly venomous insects such as scorpions and centipedes because they have evolved to convert the deadly toxins of a scorpion sting into harmless chemicals.
An interesting feature of the grasshopper mouse is that they often howl like a wolf to ward off competitors and to communicate with each other. It has been nicknamed the werewolf mouse because they are known to howl in the night with their heads thrown back, communicating over the vast desert with a high-pitched howl.