The corkwing wrasse, or gilt-head, changes color depending on its age, sex, and breeding season. For instance, during the breeding season, males have blue spotted fins and the middle of their scales gain bright blue and green pigment. In order to breed, males build nests made out of seaweed in rocks and crevices. The breeding season is made more complex due to occasional sex reversal, meaning the fish can switch between being a male and a female!