This big, beautiful bee is in serious trouble
An interesting post about the Green Carpenter Bee (Xylocopa aerata) and the Kangaroo Island population by Kevin Thiele on the Taxonomy Australia blog:
https://www.taxonomyaustralia.org.au/post/this-big-beautiful-bee-is-in-serious-trouble
Here's the list of observations on iNat from KI, one of which shows a nesting female in a Banksia trunk:
https://www.inaturalist.org/observations?place_id=6899&subview=grid&taxon_id=522827