Robuta

https://davesbirdingdiary.blogspot.com/2017/05/white-winged-tern-chlidonias.html DavesBirdingDiary: White-Winged Tern ( Chlidonias leucopterus ) . Staines Reservoir . Surrey chlidonias leucopterus staines reservoir white winged tern https://peteralfreybirdingnotebook.blogspot.com/2017/05/first-summer-white-winged-black-tern.html Non-Stop Birding: First-summer White-winged Black Tern, Staines Reservoir non stop black tern birding first summer