In drift along the river Waal (part of the Rhine in the Netherlands) the author found enormous quantities of shells of Corbicula. They appeared to be all entire and mostly articulated. This seems to indicate an absence of shell-crushing predators here as opposed to Dutch coastal areas and the Wadden Sea where these abound. The figured broken Corbicula fluminalis is an exception, it may be damaged by an oystercatcher. Why not more Corbicula are broken by oystercatchers may be due to the fact that inland breeding oystercatchers have a relatively long and sharp-pointed bill efficient for catching worms but not adapted to crushing strong bivalve shells. Shell-crushing coastal oystercatchers have shorter blunt or chisel-shaped bills adapted to shellcrushing.