Fast swimming marine predators such as dolphins, sharks, and tuna, have a streamlined body shape that minimizes drag in the water. This body shape, also known as fusiform, is elongated and tapered at both ends, with a pointed head and a streamlined tail. This design reduces the amount of drag that the animal experiences as it moves through the water, allowing it to swim faster and more efficiently. Additionally, these animals have other adaptations, such as a smooth skin, a layer of mucus, and specialized muscles, that further reduce drag and enhance their swimming ability.