Recorded using 2 x JRF hydrophones at Kinbane Head which is near Ballycastle in County Antrim.
Recorded using 2 x JRF hydrophones at Woodburn Reservoir, County Antrim
Recorded using DPA ST2006A stereo pair microphones within Rode Blimps with Dead Wombats (furry covers). Also at Kinbane Head, County Antrim
Using 2x DPA 4060 microphones, I hung them on a tree and let the hover flies land near and on them.