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