Sewage Works: Chiffchaffs were flying down to the water (actually sewage) and pecking insects from the surface, similar to the method used by hirundines. I took 551 shots to get three results. The autofocus couldn't work fast enough so I put the lens into manual focus, pointed at the favoured area and just waited until the phyllosc flew to that 12 inch depth/area.
Nikon D3 and 600mm F/4. Tripod. ISO 800. Exp -0.3. WB Cloudy. Ap. F/5.6.