These wasps are fairly common around Melbourne, but I've never been able to get a firm identification. This one spent a minute or so subduing the caterpillar (it put up a bit of a fight) and then flew off with the caterpillar.
This 12mm long wasp was working in a fresh tree hole (E ironbark) coming and going every 60 seconds. I blocked the hole for a minute to get some shots when she returned. Similar to other Paralastor but the main abdominal band has a distinct notch.
This mud dauber wasp is collecting water to make her nest. She would fly regularly from her nest (under our BBQ), straight to the water in the bird bath, then to the dirt, then back to the nest. Each trip was only of short duration.