Fact 1: Playing is just one of many ways that mammals and other animals learn how to behave.

Fact 2: Mammals include lions, bears, dogs, horses, cattle and antelopes.

Given the two facts above, answer the question "What learns to behave through playing?" with the following options: 
- otters
 - bacteria
 - viruses
 - rocks
 - lions
 - animals
 - humans
 - Birds


 

     lions    