Fact 1: Some animals' fur grows thicker for staying warm in the winter.

Fact 2: Alpaca fur is one of the softest furs in the world.

Given the two facts above, answer the question "What keeps itself warm naturally in the winter?" with the following options: 
- ferns
 - sugar
 - bushes
 - naked mole rats
 - rocks
 - ice cubes
 - alpacas
 - shrub beds


 

       alpacas  