I went to Don Edwards San Francisco Bay refuge, by Dumbarton Bridge, just by the road, to take pictures of pelicans etc ... but this bird was not at all happy with my presence. As soon as I got there, it started making a fuss and began dive-bombing me. I have crazy video of it trying to attack me. I backed off, gave it space, tried to come back, it did it again. I had to leave that area and go elsewhere. Don't know if it was mating in that area, had babies, or what.