Rio: I am drawing a fish. Does a fish have a mouth?
Me: yes.
Rio: Well, my fish does not have a mouth.

(Fool that I am, I thought “Ah-ha! A perfect moment for some “science” homeschooling!” )

Me: How will it eat?
Rio: My fish does not eat.
Me: How will it get energy?
Rio: My fish is dead.

Rio: When you are dead you do not need energy.
Me: Can the fish move around?
Rio: yes!
Me: When you’re dead but can still move around, that’s called ‘undead’.
Rio: My fish is undead! Undead fish!