The semi circle shapes cut out of the Ginger leaves in the photo are made by a bee. A leaf cutter bee. The cuttings are common in Ginger plants but the bee isn’t fussy about the leaves it uses.
The links below have some great information about Leaf cutter bees, especially the first one. I hope you enjoy learning about our local insects.
Leafcutter Bees (Megachile) (aussiebee.com.au)
Leaf-cutter Bees – Queensland Museum (qm.qld.gov.au)
Regards
Michelle Newall