Morpha

Morpha, the 'Giant Aquatic Amoeba' is an Ocarina of Time boss Link faces at the end of the Water Temple. The nucleus is able to manipulate the water, making it able to grab, constrict and toss enemies or lash out at Link. It can only be defeated if the nucleus is pulled from the main body (using the longshot) and then attacked until it dries up. Link recieves the Water Medallion after defeating this boss.