I loved watching these beautiful avocets, with their upturned beaks, at WWT Slimbridge the other day. This group tended to move together, creating constantly changing striking patterns, such as that above.
Avocets represent another UK bird conservation success story. These waders were on the verge of extinction in 19th century UK, as the wetlands that formed their habitat had mostly been drained. Since WW2 they have recovered significantly, much helped by the conservation efforts of organisations such as RSPB and WWT. Indeed this attractive bird was adopted as an emblem by the RSPB.