I don't recall hearing about screeching before. Very interesting. Some moths do use sound interference to avoid bats I believe - but this species is far too big for that reason.
Probably felt threatened by a human who is definitely a lot bigger than a bat. Apparently it was quite loud and startling. Being a hawk moth is one reason I didn't figure which wood moth it was. I guess it isn't like my hawk moths so didn't think of that.
I commonly have the problem of not finding ID of a moth etc because I am looking in the wrong group/place! As a rule the Hawk Moths hold their wings flat (like jet aircraft) above their bodies. Heps curve their wings beside or around their bodies. Heps don't bring to mind jet aircraft! I've dug out "Hawkmoths of Australia" (Mon.Aust Lep. Vol. 13) Moulds, Tuttle & Lane CSIRO 2020 p. 219 "When held or disturbed adults make an audible squeaking sound produced by rubbing a patch of friction scales on the valvae against needle-like spines on the posterior-edge of the eighth tergite, a phenomenon widespread in the genus (several sources are quoted for this).
Hey thanks for that. Interesting about the noise. So often we don't think of invertebrates making any noise at all (other than cicadas and crickets of course). So when one does do a bit of screeching it is kind of startling. Must admit, I really love invertebrates. So varied and cool.
Yeah yeah. It was just that cicadas and crickets can be so so so noisy. And were the first to spring to mind. A bit like some frogs. And for that matter birds. Even kangaroos can be noisy on occasion. Living in the bush is certainly not a quiet life.