Red breasted mergansers fishing in the Exe at Topsham.
The birds seemed to come around low tide, hunting when the channel was at its narrowest.
One day there was a group of eight directly off Topsham Quay, with another group of seven visible a couple of hundred yards further upstream.
On other days they were in pairs, seemingly engaged in synchronised swimming, diving together and surfacing at the same time and still the same distance apart.