A Skylark was singing too and later a Willow Warbler.
Suddenly a flock of starlings took off from the fields opposite the entrance of the reserve, and the crows too. Then I heard the rattling call of crows and I saw two mobbing what it appeared to be a kestrel flying straight through, however, its tail and wings were very pointy and the forewing appeared curved, a cuckoo?! I heard no calls though and the crows let it go and it disappeared into the distance.
I finished of with a walk around the lake. There were several greylag families and a few mallards. As I passed by a cleared out area in the shore, a dark, round thing plopped into the water just by me. I stayed still, and a few seconds later a water vole emerged taking little notice of me. It cut leaves of the marginal vegetation and took them away, presumably to eat. As I was taking the water vole photos, I heard a Reed Warbler singing, my first of the year, and later, I even managed to capture a shot. A total of 33 birds species (not counting the possible cuckoo).
Lesser Whitethroat, singing exposed
And another whitethroat
Water vole, taking away some leaf fragments.