Went for a walk around Whitewell. There were lots of black flies on nettles and flying clumsily around with long legs dangling - these were the St Mark's flies. There were also lots of Noon flies sunning themselves on leaves.They mate on cow pats and the female lays one egg in a different cow pat which hatches out quickly and feeds voraciously on any other larvae in the pat. The adults feed on flower pollen. There were plenty of Green Bottles and depending on the direction the light hit them they could appear almost bright copper in the sunshine.