A lovely evening for a walk along the Cart with poplar blossom hanging in the air. Two Swifts were over the river and there were three broods of Mallards on the stretch 100m east of the first bridge (all accompanied by single females): two full-grown birds, four half-grown birds (including a leucistic juvenile) [I've seen both these broods before] and three tiny young (again, incredibly, including one leucistic bird).