Spring at Chew Valley Lake, just south of Bristol, and the breeding season well underway for many birds. On open water near the lake’s edge, aggressive male Coots were fiercely defending their territories against each other.
The upper photo shows the start of such a display, with the bird flat on the water, about to rush forward in a charge towards another male.
The lower photo shows the charge, with the bird pushed down into the water by the force and speed of his advance, and his bill open as he accompanies his rush forwards with loud calls.
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Technique: Z 6 with 70-300 Nikkor lens used in DX (= APS-C) format at 450mm; 500 ISO; Lightroom, starting at the Camera Portrait v2 profile; Chew Valley Lake, south of Bristol; 5 May 2021.