Hymenoptera: Formicidae
Myrmecia nigrocincta
It is a dog eat dog world out there, or should I say insect eat insect. We have Assassin Bugs, Parasitic Wasps, Robber Flies, and let's not forget that super-efficient bug-killer, the dragonfly, all happily hunting each other.
Here we have a Bull Ant carrying off the spoils of a fight to the death with some poor winged creature that perhaps thought the Bull Ant looked like a tasty morsel. The lesson is that something full of formic acid won't be placid.