You are presented with the question "What keeps itself warm naturally in the winter?" and the following answer choices: 
- ferns
 - sugar
 - bushes
 - naked mole rats
 - rocks
 - ice cubes
 - alpacas
 - shrub beds

Now knowing that some animals' fur grows thicker for staying warm in the winter and alpaca fur is one of the softest furs in the world, choose the best answer.


 

       alpacas  