This Lesser Black-Backed Gull hauling a recently killed Feral Pigeon out of the Serpentine is not the usual pigeon-killing gull, who has deep yellow legs. And I don't think it's his mate either, as she has paler but still clear yellow legs. Is pigeon predation finally spreading to other gulls? This needs watching.

A Mandarin drake crossing the Long Water was already growing his fine breeding plumage. His head feathers haven't yet grown to their full length, when they resemble an ancient Egyptian hairstyle, and the 'sails' projecting above his wings are not yet fully developed.

There were 28 Red-Crested Pochards in the shadow of the island, probably having flown in from Regent's Park which is their main headquarters. So far the drakes show no sign of regrowing their breeding plumage.

Nor does this Tufted drake preening on the Serpentine. His sides remain dull grey, though he retains some pure white feathers underneath.

The willow tree near the bridge provided a double-deck resting place for a Mallard drake and a couple of Egyptian Geese.

A flight of Greylags descended on the Lido among the swimmers. Geese and Mute Swans have really taken over this area, and the staff are hard pressed to clean it every morning.

Still no sign of the Black Swan. If he doesn't tun up in a couple of days I shall go to Regent's Park and see if he has shown up there.

A Great Crested Grebe gave a perch to a chick. The long season of feeding the young is coming to an end, and many of the young grebes are now independent.

The young Grey Heron that has been hanging around the Lido restaurant was on one of the reed rafts, looking hopefully for an unattended table with leftovers.

A Jackdaw was looking splendid in the sunshine at the leaf yard.

On the chestnut tree above it, the male Little Owl was sunning himself on his favourite branch.

His mate was in the next tree.

This Oak Processionary moth caterpillar was moving slowly over the path below the Diana fountain. It was by itself, not in the long procession that gives these creatures their name.

The caterpillars damage oak trees, and are also covered in poisonous hairs which can cause severe itching, and sometimes breathing difficulties especially in people with asthma. They should therefore be given a wide berth, especially as the hairs can break off so that you don't need to touch a caterpillar to be affected. There was an infestation of these moths on some oak trees east of this place, and it looks as if they are spreading. I will report the sighting to the park ecologists.