A pair of Great Crested Grebes were busy building a nest inside one of the rafts of water plants at the east end of the Serpentine.
The nest can't be seen, just the birds going in and out. It is in a hole in the middle of the raft which forms a small pool, and the grebes are getting to it by diving under the raft.
The Greylag family with nine goslings came ashore to graze.
The Mandarin duckling was by itself at the Vista, looking very adult now, though its wings are not yet grown to their full length.
It ate some Twiglets out of a vistor's hand. The tastes of park birds are very far from normal.
The Black Swan was again lying on the shore with the moulting Mute Swans. When he saw me he got up and trotted over to be given a biscuit.
The pigeon-eating Lesser Black-Backed Gull had almost finished his lunch when I arrived.
The young Grey Heron in the first nest on the island was stretching a wing, looking very old and tatty.
The House Martins at the Kuwaiti embassy were swooping around the building but seldom visiting their nest holes. Evidently many of their young have fledged and are flying around with them.
But a Pied Wagtail beside the Round Pond was still collecting insects to feed his young.
The Little Owl family near the leaf yard were having a lazy day. One of the owlets was yawning ...
... and its mother was asleep, and never woke up the whole time we were there.
This fine picture of a Meadow Brown butterfly on a clover flower was taken by John Ferguson, who was at the Little Owls' tree with me.
There was a Blue-Tailed Damselfly on a blade of grass near the bridge.