There’s currently an Arctic Tern in Cardiff Bay. Was seen well by the sails  this morning [by Peter Howlett]. When I was on the barrage late morning it was right over by St David’s Hotel on the RH side [Techniquest/Mermaid Quay side], flying up & down the shore line. Apparently present yesterday also. Other than that today, a good number of House Martins keeping low, at the Cardiff end of the Barrage and the path beyond, plus a few Sand Martins.