The pigeon-eating Lesser Black-Backed Gull courteously stood aside to let his mate have a go at the latest kill.
A Herring Gull was pecking at a stone and turning it over. But this was not one of the young gulls playing. It was an adult, looking to see if there was anything edible among the algae.
A Moorhen was doing the same with another stone. There were at least twenty pieces of stone on the south shore of the Serpentine, all of them picked out of the water by young Herring Gulls to play with.
Two Black-Headed Gulls did their display of defiance, holding their wings akimbo to make them look larger, and bowing and calling. But they weren't defying at each other, as often seen. They were a pair displaying together at the other gulls, and when one came too near the pair united to chase it away.
Since we've had three of the four gulls commonly seen on the lake, here's the fourth one, a Common Gull staring at the camera near Bluebird Boats.
A descending Mute Swan water-skied its way to a standstill in front of the Diana fountain reed bed.
All the Shovellers seem to have flown away except for this one, which was preening at the island.
The pale Mallard came under the bridge with his mate and the other drake that goes around with them. These trios of two males and a female seem to be very common among Mallards which, like many ducks, have a very skewed sex ratio.
A long row of Starlings were washing on the shore near the Dell restaurant.
A Mistle Thrush sang on a tree overlooking the Rose Garden.
A Wren was looking for bugs on a rose bush, probably a rich source of aphids even in winter.
And the usual Robin waited on the bench for the pigeons to go away and give it a chance to look for birdseed under the feeder.
The female Little Owl near the Albert Memorial was preening.