Ducks and birds? What is this magic

We have a string of bells attached to the back door. We never taught her to use them, but if they tap the bells with their nose, we always open the door and let her out.

She learnt within a few days how the bells work, without us actively showing her anything. It’s easier than learning their body language or guessing if they need to go out if they have a way to communicate it directly.

What are birds? We just don’t know.

What was the 200 for?

It’s fine, the reviewer doesn’t have time to actually look at the code anyway. Lgtm, ship it.