The fence post was inundated with Cottonseeds.
I saw another smaller swarm on the same fence post yesterday.
Cottonseed Bug (Oxycarenus luctuosus)
A week or so ago, I found this swarm of bugs emerging from a crack in a fence post. They were minute in size and I probably wouldn't have noticed them but for the blood red bodies of the nymphs.
Elizabeth Quay, Perth
2 days ago