A swamp milkweed leaf beetle, Labidomera clivicollis, sequesters toxic steroids from the milkweed it eats in its body, making it poisonous to predators. Its Halloween-ish colors warn predators it doesn’t make a good snack!
Photo by Robert Aguilar, Smithsonian Environmental Research Center. Taken during SERC’s BugBlitz in Edgewater, Maryland.