1. 蜗牛   snail   shark   otter   starfish   Hint Half-n-half Clue   2. 乌龟   dolphin   octopus   turtle   whale   Half-n-half Clue   3. 箭鱼   manatee   crab   starfish   swordfish   Half-n-half Clue   4. 海星   starfish   crab   otter   octopus   Half-n-half Clue   5. 龙虾   clam   crab   seal   lobster   Half-n-half Clue   6. 海牛   otter   manatee   whale   clam   Half-n-half Clue   7. 牡蛎   dolphin   oyster   whale   lobster   Half-n-half Clue