I undertook an improptu survey of pipi shells as I walk from beach 1 to beach 2. I picked up the larger shells thinking i would check their size. then I noticed their edges. Of the eleven shells I had picked up, ten had chipped edges. Further none had the tell tale little hole near the crown indicating they had been killed by another hungry mollusc. These shells where probably all forcefully open with a knife! To say the least I was shocked that they vast majority of shells showed sign of being open and discarded on the beach.