1. Rattus rattus   camel   rat   whale   giraffe   Hint Half-n-half Clue   2. Bos taurus   man   cow   cat   whale   Half-n-half Clue   3. Panthera pardus   lion   wolf   tiger   leopard   Half-n-half Clue   4. Camelus dromedarius   dog   rhinoceros   tiger   camel   Half-n-half Clue   5. Equus zebra   rhinoceros   whale   zebra   horse   Half-n-half Clue   6. Felis domesticus   cat   elephant   fox   leopard   Half-n-half Clue   7. Balaenoptera musculus   dog   whale   man   horse   Half-n-half Clue