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

Fact 2: Fur seals grow a thick undercoat of fur, used as insulation.

Given the two facts above, answer the question "What stays warm in winter?" with the following options: 
- bushes
 - snakes
 - fur seals
 - lizards
 - Conifers
 - bullfrogs
 - some mammals
 - fish


 

   fur seals      