A Big Duck Day

Today Isla saw a Big Duck. It was a goose actually, but try telling her that. There is no one else in the World that can make me feel like an imbecile even though I know I am right. It was a goose!
She announced today that when she grew up she was going to become a lamb (we aim high in our family). I gently suggested that perhaps as she was a little girl this might not be possible. Cue 30 minutes of tearful counter argument until for the sake of her sanity (and hydration), I agree that she might become a lamb. See mummy, I told you I could, she announced with such contempt that I was embarrassed (embarrassed!) at having been so wrong.
So here was this annoying Big Duck, waddling away the day oblivious to how its genetics had caused such friction - why can't they look completely different to a duck, why does it have to be just (admittedly) a bigger version of one? Why can't it have pink wings? Two heads? Talk?! Anything that distinguishes it from a duck? Isla is looking at me distrustingly, after all if mummy can't tell a duck is a duck what else has she got wrong (apart from the ability for a little girl to grow to be a lamb).
So today has been a Big Duck day, mummy is wrong, everyone else is right, I am to hang my head in shame at my ignorance as Isla regails her friends with my delusions about What It Is Possible To Become (her best friend wants to be an iron).