a marine organism that lives in warm waters and forms clusters of polyps, which secrete calcium carbonate to build a hard skeleton
珊瑚
a marine creature with eight arms and two longer tentacles and an internal flat shell, which produces an ink-like substance when in danger
乌贼
a sea creature that has a bell-shaped body, which is gelatinous and transparent, long thin tentacles and a poisonous sting
海蜇
a large marine creature like jellyfish that lives in tropical and subtropical waters and has a poisonous sting
the microscopic organisms floating in the sea or fresh water on which larger animals feed
浮游生物
a small and simple sea creature with a hollow cylindrical body and a ring of tentacles surrounding the mouth
息肉
a marine invertebrate with a body full of holes through which water can circulate and nutrients can be absorbed
海绵
a marine creature that can change color and has a long soft body with ten tentacles helping it swim very fast
乌贼
an echinoderm that has five arms arranged in the form of a star and feeds on mollusks
海星
microscopic animals that float in bodies of water, serving as an important food source for many aquatic organisms
浮游动物
a small marine animal that is covered with spines and has a round shell, harvested for food
海胆