oh yeah forgot to mention this...
on the last boat trip i took, where there were loads of shearwaters, i actually heard them calling for the first time! would've loved to record them but between the wind, boat engine and people talking i didn't try
still really cool to hear though!! one of the things i adore about tubenoses are their noises so. really happy!! it's an interesting sound, very nasal. here's an example of great shearwater feeding calls!