A kestrel hovers over a rough marshy field by the canal at Calder Grove.
It swoops off low across the field and meets a second kestrel in a brief aerial skirmish.
The two rest for a while, perching on power-line cables.
Then there’s a second set-too and a chase away through a gap in the trees.
One bird, presumably the victor in this dispute, stops to perch further along the power line while the other disappears towards the British Oak viaduct.