1. 淡菜   mussel   starfish   octopus   jellyfish   Hint Half-n-half Clue   2. 螃蟹   crab   whale   sea urchin   manatee   Half-n-half Clue   3. 虾   manatee   seal   swordfish   shrimp   Half-n-half Clue   4. 海豚   oyster   snail   dolphin   whale   Half-n-half Clue   5. 蛤蜊   dolphin   clam   octopus   starfish   Half-n-half Clue   6. 水獭   shark   otter   sea urchin   shrimp   Half-n-half Clue   7. 蜗牛   eel   clam   snail   sea urchin   Half-n-half Clue