Explain the concept of a "mockingbird" provided by Atticus in Chapter 10. How could this be a symbol? Who could be considered a mockingbird in this novel? Why?

In How to Kill a Mockingbird, Atticus warns them not to kill a mockingbird, because it doesn't harm anybody. Boo Radley could be considered the mockingbird, because although he is away by himself and harming nobody, the children mock and disturb him.