The Black Swan and his girlfriend are back together, after several days when she seemed indifferent to him.
He took the opportunity to show off in front of her. Swans are impressed by this kind of behaviour.
Some Cormorants were fishing in the middle of a group of Mute Swans, which were undisturbed by the constant diving and surfacing. Perhaps they were using the swans as cover, as Great Crested Grebes often do -- the fish are not alarmed by harmless birds and fail to notice the hunter among them.
The Cormorants' discarded weed was being snatched by gulls, which were chasing one another for the prize. I don't think there was anything edible in it, but gulls will always seize a chance.
A Moorhen was enjoying a salad near the Dell restaurant ...
... until it was shoved aside by a swan.
Undeterred by the Saturday crowds, the fearless female Pied Wagtail was running up and down the windswept shore of the Serpentine.
There were a couple of Fieldfares in the rowan trees on Buck Hill.
A Carrion Crow was looking regal on the crown above the relief of Queen Victoria in the Italian Garden.