The purpose of the scorpions glow remains something of a mystery. There are reasons to doubt each of the reading's explanations. First, the theory that scorpions inherited the ability to glow from their ancestors has a serious problem. The ancestor species that were active during the day and needed this ability for protection and survival lived over 350 million years ago. That's a long time ago, but for the last 350 million years, all Scorpion species have been active during the night. That means they did not need to protect themselves from sunlight and UV radiation, a function that doesn't really benefit an organism may persist for a little while, but it never persists for hundreds of millions of years. Normally, traits or abilities that become useless disappear over time. Second, it is doubtful that scorpions use their glow to attract prey. In nature, the light source that's most likely to make scorpions glow is the moon, especially when it's full but studies have shown that when Moonlight is likely to make scorpions glow, for instance, on the night of a full moon, scorpions usually do not go after prey. In fact, scorpions hunt and feed most often when there is no moonlight and no light source to make them glow. This strongly suggests that scorpions Do not attract their prey by glowing. Finally, about the idea that scorpions use variations in glow to identify members of their own species. Well, it's important to note that differences in glow from one species of Scorpion to another are very small. The blue green glow is nearly the same regardless of species. And scorpions have relatively simple vision. They cannot see all the different colors that humans see. Thus, many scientists doubt that scorpions see well enough to perceive such slight differences in glow.