High pressure, light southerly wind and no cloud = raptor migration. A promising day for birds of prey moving proved to be the case.
A lunchtime trip to 'the hump' produced a steady movement of marsh harriers west. In an hour, at least 10 birds passed over, most of which were seen off by the local birds. Both 'resident' males were spending most of their time up high skydancing to move them on. Several small groups of sand martins and swallows though.
Just after 3 came the (almost expected) radio message of an osprey flying west. A quick dash out to the front of the visitor centre and a bit more radio chat produced the bird (134) circling overhead. The bird was low enough for the 30 or so visitors to see before it circled higher and drifted off west.