Female finches, which do not sing, tend to choose to mate with males who sing a specific, elaborate song. This is an example of:

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This is an example of sexual selection, where traits are selected for based on their ability to attract mates. In this case, female finches are selecting for males with a specific trait (the ability to sing an elaborate song) that they find attractive.

Female Finches, Which Do Not Sing, Tend to Choose to Mate