Spicebush swallowtail caterpillar
The gorgeous swallowtail butterfly is black or brown with a splash of bright blue or greenish blue on its hind wings. So it's hard to believe that such a somber winged creature could come from this nearly fluorescent caterpillar. (To be fair, the caterpillars start out brown, but quickly turn greenish-yellow.) The Papilio troilus's real eyes are down low in the front of its head. Those big cartoon-like circles that look like they're watching you are just skin markings.