The woolly worm (also spelled "wooly worm") is actually a caterpillar or the larvae of the Isabella tiger moth. The tiger moth belongs to the arctiidae family, which has 11,000 species of moths around the world. The tiger moth is a beautiful creature with bright colors such as scarlet, yellow, orange, and white and rich hues ranging from black to beige. Equally as bright and beautiful, the woolly worm may have a burnt orange color in the middle and it may be black on both ends. Some woolly worms, however, are completely black or completely brown.