Abstract
Animal signals that are conspicuous or extravagant are commonly explained as costly advertisements of ‘quality.’ There are, however, many other evolutionary explanations of conspicuousness, most notably those to do with ‘efficacy’ or factors making signals effective at getting their message across to receivers. Efficacy can be a major evolutionary force driving signals toward conspicuousness even if there is no selection pressure to advertise quality. Its effects have been widely underestimated through a failure to understand the variety of different ways in which it can act. Efficacy offers a variety of alternative explanations for the evolution of signals, including extravagant sexual signals and can also explain a further feature of animal signals, namely the diversity between species in the signals they use.
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Dawkins, M.S., Guilford, T. (1997). Conspicuousness and Diversity in Animal Signals. In: Owings, D.H., Beecher, M.D., Thompson, N.S. (eds) Communication. Perspectives in Ethology, vol 12. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-1745-4_3
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