Three Mandarin drakes were chasing each other around the plane tree near the Albert Memorial where the female is nesting. Two of them came to blows.
Mallard drakes at the east end of the Serpentine were also in an aggressive mood.
The Coots, for once, were quite peaceful. Here is one eating its mate's fleas, combining affection with nutrition.
A Treecreeper climbed an oak tree collecting insects for its brood.
A Pied Wagtail on the Round Pond chased a midge.
The Grey Wagtail which is now often seen at the Lido was working its way along the shore.
The Mute Swans nesting near the bridge have another egg.
But the egg that went missing from the nest several days ago was lying on the ground broken and empty. There has been no sign of a fox attack here. We have a nasty feeling that the eggs are being taken by rough sleepers in the park. This also apparently happened in the same place last year.
The Carrion Crows on the Parade Ground were frightened by the Royal Artillery's 41-gun salute for the Queen's birthday, and settled on the other side of the Serpentine. But this one stayed on the north shore to eat some rice.
The pigeon-eating Lesser Black-Backed Gull chased some Herring Gulls off his territory and came back to his mate on the Dell restaurant roof.
Tom sent me this interesting picture of the Green Woodpeckers mating in a plane tree on the path between Physical Energy and the Speke obelisk. We must keep an eye on their nest hole.
He also sent this fine picture of a Song Thrush.
The leaves are coming out on the Little Owls' chestnut tree near the leaf yard. Feeling more secure now there is a bit of cover, the male owl came out on to a branch.
A Great Tit on a lower branch was agitated by the owl, and chattered loudly.
A Robin sang on a copper beech in the Rose Garden.