Definition of aposematism
: the use of a signal and especially a visual signal of conspicuous markings or bright colors by an animal to warn predators that it is toxic or distasteful : warning coloration Ladybugs are a good example of aposematism, when the bright colors of red, orange, yellow and black serve as a defense mechanism that warns potential predators of past poisonous or unappetizing results. — Carol Coogan, Times Union (Albany, New York), 16 June 2008
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