A black-crowned night heron, one of several we see hanging around the ferry dock at Jack London Square in Oakland. We usually spot two hanging out on the rocks right at the water line south/east of the dock. They are in the midst of some pretty heavy human traffic, but they are still skittish when they detect you getting close. Over the past half-year or so, a great blue heron has been frequenting the same area. Last night it was roosting on the dock next to the USS Potomac, FDR's presidential yacht.