On arrival back home with their new pet hamster, Léon explained to Anna that the nicest one had be an all-white one but that it had been reserved so they couldn't choose it. So they had chosen the next nicest one.
Anna thought for a moment and then said (completely seriously). 'That's probably just as well. If we'd got a cat one day and our hamster had been white, it might have mistaken it for a mouse and eaten it, but this one looks much more like a hamster so a cat wouldn't get mixed up!'
I can see an obvious flaw in that logic, so it is just as well we aren't planning on a cat any time soon.