1. hipopótamo   hippopotamus   polar bear   antelope   shark   Hint Half-n-half Clue   2. castor   whale   beaver   mare   jackal   Half-n-half Clue   3. boi   shark   ox   lioness   cheetah   Half-n-half Clue   4. lebre   hare   otter   dolphin   bison   Half-n-half Clue   5. foca   seal   stag   shark   otter   Half-n-half Clue   6. morsa, leão marinho   otter   bat   hare   walrus   Half-n-half Clue   7. lontra   otter   toad   penguin   whale   Half-n-half Clue