Still on the golf course (The Warwickshire) theme - I found this firmly shut #freshwatermussel#swanmussel 50 metres from a small lake on the course. Is it possible that a heron or an otter took it and couldn't open it? I placed it back in the lake and hope that it survived. I've seen them before but never this large - it was at least 12 cms long and how old? Does anyone know? My guess is more than ten years!