The Gull-billed Tern is still present as of today, though the White-winged Black Tern at the same spot is now a fading memory. Here's a bit of video to keep it fresh in the mind.
White-winged Black Tern, Baile an Reannaigh, 3rd June 2019 (First clip, Michael O'Clery, second clip, David O'Connor). Click the '4-arrows' symbol for fullscreen.
Gull-billed Tern, Baile an Reannaigh, 7th June 2019 (Kilian Kelly).
Gull-billed Tern, Baile an Reannaigh, 7th June 2019 (Kilian Kelly).
Gull-billed Tern, Baile an Reannaigh, 7th June 2019 (Kilian Kelly).
Gull-billed Tern, Baile an Reannaigh, 7th June 2019 (Kilian Kelly).