The Chile de árbol (Spanish for tree chili) is a small and potent Mexican chili pepper also known as bird's beak chile and rat's tail chile. These chilis are about 5 to 7.5 cm (2.0 to 3.0 in) long, and 0.65 to 1 cm (0.26 to 0.39 in) in diameter. Their heat index is between 15,000 and 30,000 Scoville units.
