Yet most lizards have well-developed ears. So that raises the obvious question: if they don’t use sounds to communicate, what do they use the ears for?
Ryo Ito and Akira Mori of Kyoto University in Japan supply one answer: to eavesdrop on other animals. Writing in The Proceedings of the Royal Society B, they describe how the Madagascan spiny-tailed iguana overhears the alarm calls of nearby birds to protect itself from predators.
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