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22. You perform an experiment to test whether female birds prefer males with longer tail feathers. You find that they do, and
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Having a long tail increases a bird's daily metabolic rates by 1 to 3 percent, which means the bird has to visit 1 to 3 percent more flowers in its territory, This implies that more energy is needed by the bird to keep the feathers intact. Also after a certain increase in the size of the feathers it can create imbalance of the body during flight which can cause a problem. Therefore, after its optimum the male bird's tail feather size does not increase.

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