What is this Bird?

Don’t laugh if it’s a really dumb question, but what is this UFO? We saw him/her in Paris in late March, outside our little flat, flying about with a buddy. Very large, with a LOUD voice that it was using an awful lot. I’m sorry I couldn’t get a better picture, but it had lovely markings which you can sort of see here. So what birdie is this, dear readers? One of you must know.
march292015 050