 The study examined the evolutionary process of two separate populations of Mexican tetras, one living in caves and the other living in open water. The researchers found that both populations had experienced similar adaptive traits, such as reduced pigmentation and increased body size, but through different mechanisms. The cave population had lost its ability to produce melanin, while the open, water population had evolved to become larger. Both populations also showed evidence of convergent evolution, whereby similar traits were developed independently from each other. The researchers concluded that this was due to the presence of selective pressure, which favored certain mutations over others. They further suggested that the presence of a specific environmental factor, such as the lack of light in the caves, could have contributed to the rapid evolution of these traits. This article was authored by Rachel L. Moran, Emily J. Richards, Claudia Patricia O'Neilis Garcia, and others.