Mermaids or Merfolk are believed to be descendants or the result of experimentation between the Atlântidans and Sims. There are very few mermaid colonies. Mermaids can transform their appearance, living on both land and sea, but they require water to survive. Mermaids must replenish their water regularly through swimming and drinking plenty of fluids. Mermaids also can stay below the water’s surface for an abnormal amount of time.