Ducks are outnumbered by thousands of knot and oystercatcher as they congregate and perform spectacular murmurations at Snettisham, Norfolk on October 20, 2020. This spectacular happens when a high tide forces the birds from their feeding ground on The Wash, further up the beach and onto the shingle, before the tide recedes and they can feed on the mudflats again. (Photo by Paul Marriott/Rex Features/Shutterstock)
