, Volume 13, Issue 7-8, pp 655-671

The Evolution of Multimodal Warning Displays

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Multimodal warning displays combine visual signals with components produced in other sensory modalities, for instance, aposematically coloured insects often produce a pungent odour or harsh sound when they are attacked. Recent research has focussed upon a particular odour, pyrazine, which is commonly associated with warning coloration. Our experiments have shown that pyrazine elicits hidden unlearned biases against particular visual aspects of food in foraging domestic chicks. Here we asses the current state of our knowledge about these biases, reviewing our results using pyrazine and other odours, and also presenting new data showing that sound can produce similar effects. We will discuss potential psychological mechanisms by which these foraging biases are achieved in avian predators, and potential pathways for their evolution.

This revised version was published online in July 2006 with corrections to the Cover Date.