The four-eyed fish, scientifically known as Anableps, actually only has two eyes like most other fish. However, their unique eye structure allows them to see above and below the water's surface simultaneously. This adaptation gives the appearance of four eyes, hence the name.

Despite their name, four-eyed fish only have two eyeballs. These eyeballs are divided in such a way that the top half of each eye is adapted for seeing above the waterline, while the bottom half is adapted for seeing below the waterline. This allows them to keep an eye out for predators and prey both above and below the water's surface at the same time.

Four-eyed fish are primarily found in the coastal waters of Central and South America, where they inhabit brackish and freshwater environments. They are known for their unique hunting technique, where they swim close to the water's surface and use their specialized eyes to spot insects and other small prey both in and out of the water.

Despite their unusual eye structure, four-eyed fish are not the only animals with this adaptation. Some species of amphibians, such as the anableps frog, also have eyes that are divided in a similar way. This allows them to see both above and below the water's surface when hunting for food.

In conclusion, the four-eyed fish actually only has two eyeballs, but their unique eye structure allows them to see above and below the water's surface simultaneously. This adaptation helps them spot predators and prey more easily and gives them a distinct advantage in their coastal habitats.

Overall, the four-eyed fish is a fascinating example of how evolution has shaped the visual abilities of different species to help them thrive in their environments. Their specialized eyes may give the appearance of four eyes, but in reality, they only have two eyeballs like most other fish.

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