The Great Crested Grebes at the east end of the Serpentine, who have been playing with the idea of a nest inside a reed raft, are now seriously building it. Here one of them adds a dollop of soggy weed to the mess that a grebe calls home.

You can see this nest from the balcony of the Dell restaurant, but not from the terrace below. I could have got a better angle by standing on one of the concrete tables, but unfortunately some people were sitting at it so I had to stay at floor level.

The Canada Goose nest on the island built for the unlucky swans is still going strong. Here the goose is turning over her eggs.

The House Martins were very active at the embassies in Knightsbridge. Here one of them arrives at a plaster rose on the Kuwaiti embassy where it looks as if there are three nests -- certainly there were a lot of birds coming and going.

Others were cavorting over the French embassy, scorning the bird-repelling spikes put up by the diplomats.

A Pied Wagtail was running around the roof of one of the small boathouses looking for insects between the slates.

A Blue Tit was bathing in the little pool at the top of the waterfall in the Dell.

A young Long-Tailed Tit was preening its fluffy feathers while waiting for an adult to bring it an insect.

Young Long-Tailed Tits are cared for not only by their parents but by aunts and uncles that have not managed to nest successfully.

A Starling investigated a plate at the Lido restaurant, found that the fish and chips were all gone, and took a peck at the lemon. It didn't like it, and flew away to find something better.

The male Little Owl was out on a branch of his usual tree. It is quite hard to find him in the leaves now.