Scientific Career
Zahavi is best known for his work on the handicap principle, which explains the evolution of characteristics, behaviors or structures that appear contrary to the principles of Darwinian evolution in that they appear to reduce fitness and endanger individual organisms. Evolved by sexual selection, these act as signals of the status of the organism, functioning to e. g. attract mates. He expanded it with theories on honest signalling and the idea that selection would favour signals that impose a higher cost, those that are not easily cheated on.
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