Fact 1: Shelter is used for protection by animals against weather.

Fact 2: Many snakes seek shelter from the winter weather by holding up in dens.

Given the two facts above, answer the question "Why does a snake look for shelter in the winter?" with the following options: 
- Protection
 - Food
 - adding heat
 - Water
 - When it's cold
 - Darkness
 - energy barrier
 - hydration


 

 Protection        