Almost certainly grebe chicks

The male Little Owl at the Serpentine Gallery was moving around in the nest tree, and appeared briefly at the top.

One of the owlets at the Round Pond stood on the branch in the horse chestnut tree where all the family go to keep out of the wind.

An Egyptian Goose occupied the top of their nest tree.

The male Peregrine on the barracks was in a huddle and wouldn't look round. You can tell he's the male of the pair because he has a brownish front -- though that's only a feature of this individual and not of male Peregrines in general.

A brief sunny spell lit up a Robin on the willow near the bridge.

A young Grey Wagtail hunted up the edge of the stream in the Dell.

A Magpie perched on the dead willow near the Italian Garden.

A Jay waited to be fed on the peculiar spongy bark of the Lucombe oak in the Flower Walk, which is a cross between a turkey oak and a cork oak.

The pigeon-eating Lesser Black-Backed Gull was eyeing possible prey from the water ...

... until he was moved on by a Mute Swan. Not even this ferocious bird can stand up to a swan.

Three male swans tried to dominate each other on the Long Water.

The Great Crested Grebe on the nest opposite Peter Pan had its wings raised as they do when they have chicks on their back, though I couldn't see any little heads peeping out.

A Moorhen's enormous feet allow it to walk on a mat of algae on the water surface, but when it stops it slowly sinks in. It got too close to a Coot with chicks and was chased off.

The geese that arrived to moult in June are being surprisingly slow this year and many of them still can't fly, so large flocks of Canadas and Greylags remain in the park.

A young fox in the Dell groomed, stretched, yawned and loped away.

An Essex Skipper butterfly perched on a thistle in the clump at the foot of Buck Hill.