Sea cucumbers are cylinder, or cucumber, hence the name-shaped invertebrate animals that live in many different ranges of the ocean. They can be found from warm tropical waters to cold deep sea trenches. They are most diverse to tropical shallow-water coral reefs. The biggest sea cucumber is the tigerÕs tail and can reach lengths of up to 2 m long. Most sea cucumbers are about 20 cm in length, while some adults may not grow to be over a centimeter. Sea cucumbers enjoy the life-span of five to ten years. Despite at first appearing as a plant or mineral on the ocean floor the sea cucumber, or Holothuroid, is an animal.