Some animals' fur grows thicker for staying warm in the winter, and winter is the coldest season. Given these facts, what do some animals grow thicker fur for staying warm during among the following options:
- dry and hot
 - in the autumn season
 - dry conditions
 - coldest season
 - colder weather
 - When it's cold
 - subtropical
 - Under 32 degrees


 

    coldest season     