There are several species of animals that do not have eyes, as they have adapted to their environments in different ways. One notable example is the Mexican tetra fish, also known as Astyanax mexicanus. Some populations of this fish, which are found in caves, have evolved to live in complete darkness. Over time, these cave-dwelling populations have lost their eyes through a process known as regressive evolution.
In the absence of light, the development and maintenance of eyes may not provide a significant advantage, and the energy saved by not developing and maintaining eyes can be redirected to other survival-related traits. As a result, some cave-dwelling species undergo adaptations that lead to the loss of eyes and pigmentation. The Mexican tetra fish is just one example of an eyeless species, and similar adaptations can be found in other subterranean or deep-sea-dwelling organisms.
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