Of course it's not a wine! You'll see warnings about these and how they can ruin your wine!
They're the little fruit flies that fly very slowly round the fruit bowl when the bananas have gone brown, they love over ripe fruit and are attracted to the smell of fermenting fruit.
They re not a problem as long as you use fresh unbruised fruit and don't leave your wine fermenting in the bucket too long! Sometimes you see them trapped in the airlock which means it's doing it's job!