Zero, the Additive Identity

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Here's a silly video to start us off.

Then what is the right definition of zero?

Okay, we now know what an identity is. But how does the definition you chose lead to $0$?

Great! Now let's combine what we just learned from those two questions with one last question:

Well, now you know what the real definition of zero is. That is what the owl was supposed to say, after all. Feel free to play on with the video, but this time you can rage at the owl for speaking a nonsense definition and you can supply a no-nonsense definition, have fun!