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Rodolia cardinalis
Here is a very cute red and black ladybird beetle This predatory beetle is used in biological control of scale insects.
On Acacia
These are endemic to Australia but exported around the world to control cottony cushion scale bug (Icerya purchasi), which is also endemic to Australia but exported around the world. Mark has captured the action here. http://www.projectnoah.org/spottings/853... http://www.youtube.com/watch?v=0uhztcshx...
So it is, thank you Mark. Here is the one you saw, attacking a bug.
http://www.projectnoah.org/spottings/853...