The World Turned Upside Down, But in a Nice Way

Looking west toward San Mateo

It's a nice picture of San Mateo from across the lagoon, but what is that odd-looking bird near the top with a streamer behind it?

Sometimes the skies are so bright and the water so still that one can't tell if a picture is upside down, which this one is.

Yes, that's a duck a-swimming.

You can't believe everything you see, especially on the internet.