You have something personal to discuss with a friend. You arrange to meet for a coffee and a chat in a public restaurant. It’s noisy, and you have a good heart to heart in the belief that nobody else can hear what you’re saying. Or you leave a message on an answer phone or via a phone app and think that it’s just between yourself and the recipient.
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Ground-nesting birds have a hard time raising their young, with many eggs and chicks falling prey to predators like chipmunks. One way they overcome these problems is by eavesdropping on the chips, chucks and trills that their enemies the chipmunks use to communicate with each other, and then using this information to find safer spots to build their nests.
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