Fact 1: Mammals can also generate little bursts of heat by shivering.

Fact 2: All humans are mammals.

Given the two facts above, answer the question "what can generate little bursts of heat by shivering?" with the following options: 
- rabbit
 - goats
 - bears
 - humans
 - clouds
 - trees
 - animals
 - the sun


 

    humans     