Some animals' fur grows thicker for staying warm in the winter, and for one, animal fur becomes thicker and more abundant during the winter months. Given these facts, in the winter months, animal fur is what for warmth among the following options:
- more thin
 - more abundant
 - more dark
 - important habitats
 - protect them
 - support
 - hard outer covering
 - more sparse


 

  more abundant       