Brown Pelicans sometimes flock to the North Basin, the body of water east of the park, in large numbers; more than a hundred came in late August. This day, only a pair arrived. They circled over the glassy water, took a dive or two without visible result, and then settled, sometimes just inches from one another. They moved very little, and sometimes not at all, for about ten minutes. Then, responding to a command beyond human senses, they opened their wings and took off westward.