The bubbles in the foreground are coming from the aeration membrane,
which is hooked up to our new windmill. See post below.
I learned a little more about patience at the pond yesterday. I waited quietly, camera in hand, mosquitoes biting, for more than half an hour as a young Great Blue Heron waited quietly, too--eyes alert, food focused. Just when I had decided to give up, there was a splashing victory for the heron.
Don't watch this if you're squeamish. A sad day for the poor bullfrog, but I was pretty impressed with the heron.