Millions of years ago, the apes descended from the trees. They began to stand upright as they waded in the shallow tide pools and feasted on the shellfish that lived there. We are descended from these apes, all of us. When the volcanoes shook the earth, some of the apes retreated back to the land, but another group stayed. The apes who went inland are the ones you know, for, assuming you are human, you evolved from them. The others stayed by the sea, a bountiful source of food. As they began to swim more and more to find food, their hair became thinner, their hands and feet larger, and their eyes wider as they adapted to the underwater world. Eventually they only went ashore to sleep and give birth. They were able to hold their breath for an hour at a time, as long as a dolphin. Dolphins are their best friends and fishing companions. The migrate with and help whales give birth. Just when they were becoming fully adapted marine mammals, a witch doctor in Africa cast a spell, both cursing and blessing them for all eternity. The females have the ability to go on land as humans until their eighteenth birthday. They can change forms willingly. However, at midnight on their eighteenth birthday, whichever form they take is the form they take forever. They must choose wisely though, for, as humans, they are infertile and cannot bear children and in the sea, they are hunted by a great predator and lose all memories of their lives as humans.