Green ants (Rhyditoponera metallica) bite hard when you get in their way. It seems they like these strange little flowers a lot.
Major worker (Pheidole sp.) talks to a minor worker of the same speicies. Polymorphic ants have various shapes and sizes in the same colony. Kyogle, NSW.
This ant (Pheidole sp.) has a big head that looks a bit like a bum. I don't think it's actually called a big bum head ant though. Kyogle, NSW.