Conspicuous colouring that warns a predator that an animal is unpalatable or poisonous.
 Example sentencesExamples
-  All salamandrids have toxic skin secretions (some produce tetrodotoxins), and many have bright warning coloration that is used in defensive displays.
 -  Pyrazines are extremely volatile compounds and occur alongside warning coloration in insects from widely differing taxonomic groups.
 -  Aposematic coloration (conspicuous advertisement of a prey's unpleasant qualities) or warning coloration is found in a wide array of animals.