 High serotonin increases motivation to interact with clients, and a lack of serotonin decreases client interaction and slows learning.Mimic species have evolved body forms, patterns, and colors which imitate other species to gain a competitive advantage.One of the most studied examples of mimicry on coral reefs is the relationship between the aggressive mimic "Plagiotremus rhinorhynchos" (the bluestriped fangblenny) and the cleaner wrasse model "Labroides dimidiatus".