1. Balaenoptera musculus   cow   zebra   camel   whale   Hint Half-n-half Clue   2. Canis familiaris   rat   dog   tiger   horse   Half-n-half Clue   3. Elephas maximus   rat   wolf   elephant   cat   Half-n-half Clue   4. Camelus dromedarius   wolf   whale   fox   camel   Half-n-half Clue   5. Alopex lagopus   fox   zebra   wolf   giraffe   Half-n-half Clue   6. Rattus rattus   dog   man   rat   camel   Half-n-half Clue   7. Equus caballus   zebra   giraffe   elephant   horse   Half-n-half Clue