1. ballena   bat   cheetah   whale   chimpanzee   Hint Half-n-half Clue   2. murciélago   hippopotamus   whale   bat   bison   Half-n-half Clue   3. canguro   mare   whale   kangaroo   penguin   Half-n-half Clue   4. koala   jackal   penguin   chimpanzee   koala   Half-n-half Clue   5. liebre   bat   hare   chimpanzee   hippopotamus   Half-n-half Clue   6. bisonte   ox   hare   bison   hyena   Half-n-half Clue   7. oso polar   porcupine   polar bear   hippopotamus   beaver   Half-n-half Clue