1. castor   otter   ewe   beaver   mare   Hint Half-n-half Clue   2. comadreja   beaver   chimpanzee   weasel   shark   Half-n-half Clue   3. canguro   cheetah   sea lion   kangaroo   hedgehog   Half-n-half Clue   4. tiburón   rhinoceros   shark   ox   weasel   Half-n-half Clue   5. bisonte   hare   ram   bison   sea lion   Half-n-half Clue   6. tejón   cheetah   panda   badger   shark   Half-n-half Clue   7. buey   kangaroo   ewe   gorilla   ox   Half-n-half Clue