' That was the only time I ever heard Atticus say it was a sin to do something, and I asked Miss Maudie about it. 'Your father's right,' she said. 'Mockingbirds Mockingbirds Mockingbirds are a group of New World passerine birds from the family Mimidae. They are best known for the habit of some species mimicking the songs of other birds and the sounds of insects and amphibians, often loudly and in rapid succession. https://en.wikipedia.org › wiki › Mockingbird Mockingbird - Wikipedia don't do one thing but make music for us to enjoy …but sing their hearts out for us. That's why it's a sin to kill a mockingbird."