What animals warn about the presence of chemical weapons?

As a rule, poisonous animals or insects warn other animals that they are poisonous, dangerous and not edible with their bright, provocative (demonstration) color. For example, a ladybug has a bright red color with black specks; wasp – black and yellow striped color; the skin of the South American poison dart frog has a bright orange color; the wings of a Mormon butterfly are decorated in such a way that from a distance they resemble a snake’s head, the harlequin beetle (cotton bug) is decorated in bright turquoise-blue-red colors.