Appendix B. Slow mode replay (1/4 speed) of a Western Sandpiper biofilm-feeding on the Roberts Bank mudflat, the Fraser River estuary. The viscous biofilm bolus retrieved from the surface sediment can be seen between the bills. Subsequently, the Western Sandpiper may be segregating digestible materials (organic matter) from other materials (sediment particles) by opening and closing the bill and moving the bolus back and forth.
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