If you are as ardent a fan of the National Geographic channel as I am, some of or all the following scenes should be familiar to you. A male lion roaring to assert his dominance over a pride; female baboons with their bright sexual swelling indicating their readiness to mate; bees performing their waggle dance to show the direction and distance of flowers; a female elephant caressing her calf to soothe him; a deep-sea squid emitting light to attract prey; and a meerkat squealing to warn her family of a predatory eagle. All these are examples of signals, and no textbook on evolutionary theory
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