1. ヒトデ   starfish   jellyfish   eel   whale   Hint Half-n-half Clue   2. マナティ   eel   lobster   turtle   manatee   Half-n-half Clue   3. タコ   shrimp   snail   crab   octopus   Half-n-half Clue   4. カキ、シンジュガイ   lobster   octopus   oyster   otter   Half-n-half Clue   5. ウニ   sea urchin   mussel   turtle   seal   Half-n-half Clue   6. サメ   octopus   shark   starfish   mussel   Half-n-half Clue   7. ヘビ   dolphin   snail   sea urchin   whale   Half-n-half Clue