aposematic

1. (zoology, of a coloration or marking) That serves as a warning to predators, as of toxicity, especially falsely.Examples: "Episematic characters are far less common than aposematic, and these than cryptic; although, as regards the latter comparison, the opposite impression is generally produced from the fact that concealment is so successfully attained."; "Contrasting patterns of red and black are classic aposematic warnings that signal would-be predators to “back off, leave me alone … if you do not, you will regret the consequences.”"