We've had to cove the pond to the left with netting to protect the fish from a very interested Great Blue Heron which has been visiting our yard on a very regular basis. I think they must have a rookery just over the hill from us and we must look like an easy food source.It hasn't been back for a few days, so maybe... We also haven't been able to get a good photo so I'm including one from another source. Since they don't mind nesting within a short distance of the downtown core of Portland, they're the official city bird!
Image by mikebaird via Flick