The highest of high tides push the birds from their feeding grounds on the mudflats of The Wash onto the lagoons of the RSPB Snettisham nature reserve. The tide height usually needs to be 6.8m or higher as this is the point at which the bay of The Wash is filled with seawater and there is no more room for these wading birds to stand and feed on the mud. I was fortunate enough to witness this spectacle in September of this year.
