Chiles de Arbol means "tree chili" in Spanish. Other names for this pepper include bird's beak chilies or rat's tail chilies. The Chile de Arbol is a small, thin Mexican pepper that has a smoky grassy characteristic with an acidic heat, that is about 6 times hotter than a jalapeño pepper. On the Scoville scale, these range from 15,000 to 30,000 heat units. They are a wonderful addition to salsas, pickling brines, Tex-Mex chili, or homemade hot sauces.