A clarification, relevant the discussion below: Tree from Brady et al 2006.
Reader Sam Tomkinson has been experimenting with my tracing-paper diffusion trick and took this lovely shot of a Myrmecia bull ant in western Australia: Myrmecia are aggressive ants with a nasty sting, so kudos to Sam for putting his life at risk to bring us a taste of wild Australia. It also occurs to me to explain that Aussies call the larger Myrmecia species "Bull Ants", and "Red" is used as a modifier.  They aren't predators of energy drinks.  Although if they were, those teeth could probably open a can.