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Aposematism: noun; from the Greek ἀπό apo meaning ‘away’ and σῆμα sema meaning ‘sign’; a term developed in the 19th century, reputedly by Edward Bagnall Poulton (a British evolutionary biologist), for the bright colorations or conspicuous markings that creatures use to warn or repel predators. Typical examples are things like bright yellow frogs or orange-and-black-striped caterpillars, whose colours serve as a warning to potential predators that they taste bad or might even be poisonous, and, butterflies, like the Peacock shown here, with big bold eye-type markings that make them look larger than they really are.

180425 Aposematism Peacock butterfly