The Pipevine Swallowtail is a beautiful fluorescent blue butterfly that’s commonly found in North and Central America. Its larvae, on the other hand, is an armored congealed-blood-red caterpillar with tinted visor shades for eyes and a quadruple row of blunt horns running across its body.The caterpillars live in groups while they are young, but over time they will wander off on their own before entering the chrysalis stage. They also change color as they grow, shifting from red to black, while their horns take on a bright orange hue. The bright colors are a warning—Pipevine Swallowtail caterpillars feed primarily on the Pipevine, a poisonous plant, and retain the toxins from the leaves in their own bodies.