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22. You perform an experiment to test whether female birds prefer males with longer tail feathers....

Question:

22. You perform an experiment to test whether female birds prefer males with longer tail feathers. You find that they do, and
22. You perform an experiment to test whether female birds prefer males with longer tail feathers. You find that they do, and, in fact, they prefer even longer tail feathers than you ever see on males in the population. Assuming that this trait has had enough time to evolve to an optimum, what is the most likely explanation for why tail feathers are not even longer in the population?

Answers

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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