The Yellow-crowned Night-Heron is another bird that is uncommon in Southern California, but there are at least two that are frequently seen at the San Diego River Estuary next to Robb Field.
These birds are accustomed to people, and like yesterday's bird, may be so intent on their hunting that they will sometimes walk right past you if you sit quietly by the water's edge.



Did you know? (I didn't!)
The Black-crowned Night-Heron is an opportunistic feeder, whose diet can consist of fish, crustaceans, insects, small mammals, and even birds, whereas the Yellow-crowned Night-Heron specializes in crustaceans.
This became apparent to me this year as I have spent hours watching Yellow-crowned Night-Herons hunt. What is even more astounding is their accuracy. They almost never miss their prey! I would say when they strike at a small crab, their success rate tops 90%.
What do they do with the indigestible shells?
Well, like owls coughing up a pellet, the Yellow-crowned Night-Heron will regurgitate a small mass of shells. I have an excellent picture of this, but for the time-being, anyway, I'm not posting it, since it is not the most pleasant picture!