Caterpillars that are characterized by black-and-yellow coloration are the redhumped caterpillar, the yellownecked caterpillar, the cloudless sulfur caterpillar, the spotted tussock moth caterpillar and the American dagger moth caterpillar. The American dagger moth caterpillar and the yellownecked caterpillar are found throughout the eastern United States.
The dagger moth caterpillar has an all-yellow body with black tufts of hair on either end. The yellownecked caterpillar is black with four yellow stripes that run down the length of its body. When threatened, the yellownecked caterpillar contorts its body into a horseshoe shape to frighten away potential predators. The redhumped caterpillar is found throughout California. It is identified by a yellow body, black stripes and a bright red head. The caterpillar derives its name from a hump that is located directly behind its head. The spotted tussock moth caterpillar can be found throughout North America and is identified by a single large yellow stripe that is sandwiched between two larger black stripes on the head and rear. The caterpillar is also known as the woolly bear caterpillar due to its fuzzy appearance.