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The striking bright blues, yellows, and oranges of poison dart frogs are a classic example of warning coloration, sending a message to predators to stay away.

The Monarch is thus an example of what has often been called warning coloration.

The most interesting and most conclusive example of warning coloration is, however, furnished by caterpillars, because in this case the facts have been carefully ascertained experimentally by competent observers.

There has, however, recently been a reaction among naturalists in regard to the validity of many supposed examples of warning coloration and the whole subject is still open to careful investigation.

Along with the theory of warning coloration the theory of mimicry has been propounded.