If the eyes were located toward the front of the head,the organism was probably an active swimmer.If the eyes were in the back of the head, the organism might have been an ocean bottom dweller. in most species,the eyes were located midway on the head-ideal for an organism that both crawled on the seafloor and swam in the water.
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Scientists have been able to infer things about how trilobites lived by examining their eyes. It's believed that their fairly complex eyes allowed them to see well, which made them adept at catching prey and avoiding predators. Some species had eye shades, which means that they were probably diurnal.