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Stalk-eyed flies are a good example of sexual selection, where their eyes, which are located on long tubes, are an important part of their sexual reproduction.

These tube-shaped eyes enhance their vision but also pose a challenge to the birds' aerodynamics, meaning that these birds may have difficulty flying. Their teeth are an example of the dilation of the eyes of birds, where males may have eyes wider than their body length. This is part of a sexual strategy where females seem to favor males with larger eyes.

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