Clearwing Swallowtails (Cressida cressida)
It’s rather unusual to get footage of this butterfly as they never seem ‘stationary’ for long. The female is the larger of the two and the older name of ‘Big Greasy’ comes from the transparent appearance of their wings, appearing to be similar to greaseproof paper.
They are fairly-common butterflies in Southeast Queensland, seen mating in mid-September 2020. I’ve ‘slowed’ the clip down by 50% to improve the views.