The Coots nesting at the bridge hatched three chicks, but had lost two of them when I filmed the nest this morning, and the last one had gone in the afternoon. The nest is completely in the open, and next to a line of posts on which hungry Herring Gulls perch waiting for their chance.

There are still three eggs on the nest but the prospects don't look good.

Yesterday the Great Crested Grebes nesting on the Serpentine island started making their nest more comfortable with the stringy water plant that is growing all over the lake.

Apparently the idea was a success, because today they have added a lot more.

A Moorhen sheltered under a nettle growing beside the Serpentine.

The Mute Swans on the Long Water still have their last cygnet, which was resting with its mother on the little island.

A close-up of an Egyptian Goose regrowing its wing feathers after moulting. It's difficult to imagine what this feels like.

Two more Red-Crested Pochard drakes have appeared on the Long Water, having flown in from St James's Park or Regent's Park, where there are regular colonies of these ducks. Their bright plumage is beginning to go off, but they still have their absurd bouffant hairstyle.

Two Carrion Crows found an ants' nest in the Dell and were bathing in ants, which apparently reduces the number of parasites in their feathers. The ants can be eaten too, a poor reward for their services.

A young Magpie on the Vista begged both parents for food. Evidently they thought it was old enough to find its own, but at last its pleas succeeded and it got an insect.

The tatty Great Tit near the bridge has become a regular customer for pine nuts, and now always comes out when I go by.

A young Great Tit near the Albert Memorial begging its parents to feed it, fluttering its wings and uttering pathetic cries .

The parents regularly come to me when I'm photographing a Little Owl here. This morning an owl was visible but mostly hidden by leaves. When it started raining in the afternoon, the owl flew to the nest tree where there was better shelter. But the light was very dim.

The Feral Pigeon with the Rorschach test ink blot on its back was at the leaf yard.

Yesterday Tom saw a Grey Wagtail on a television aerial in Montpelier Street near Harrods, an unusual place for a bird that mostly stays near water.

I think the explanation for this is that it was on its way between Hyde Park and a small colony of these birds around the old coal wharf for the sewage pumping station next to Chelsea Bridge.

The 2019 Serpentine Gallery pavilion by Junya Ishigami is now finished. There will be a private preview tomorrow evening, and on Friday it will be open to the public.

The curved roof is made of 61 tonnes of thick slates, resting on a metal mesh supported by alarmingly thin steel poles. The shape is echoed by a little artificial mound, in the same way as the distant view of Mount Fuji in Hokusai's The Great Wave.