Identify the purpose of this statement.
Cats purr when they are content.
The purpose of this statement is to provide information about the behavior of cats and to convey that purring is a sign that a cat is feeling happy and content.
Complete the following task based on the instruction and optional input provided.### Instruction:
Identify the purpose of this statement.

### Input:
Cats purr when they are content.

### Output:
The purpose of this statement is to provide information about the behavior of cats and to convey that purring is a sign that a cat is feeling happy and content.