Fact 1: An animal usually requires a warm body temperature for survival.

Fact 2: Squirrels hide and sleep in a secret warm place all winter.

Given the two facts above, answer the question "What requires hiding and sleeping for survival?" with the following options: 
- bacteria
 - rice
 - amphibians
 - organisms
 - Frogs
 - trees
 - humans
 - animals


 

        animals 