1. Rana tigrina   leopard   frog   lion   tiger   Hint Half-n-half Clue   2. Homo sapiens   lion   man   cow   frog   Half-n-half Clue   3. Alopex lagopus   zebra   fox   wolf   giraffe   Half-n-half Clue   4. Elephas maximus   zebra   elephant   cow   rhinoceros   Half-n-half Clue   5. Canis lupus   wolf   rhinoceros   frog   rat   Half-n-half Clue   6. Rattus rattus   rat   fox   whale   leopard   Half-n-half Clue   7. Bos taurus   rat   fox   cow   zebra   Half-n-half Clue