Atta cephalotes is a species of leafcutter ant in the tribe Attini (the fungus-growing ants). A single colony of ants can contain up to 5 million members, and each colony has one queen that can live more than 15 years. The colony comprises different castes, known as 'task partitioning', and each caste has a different job to do.
I accidently left my juice box in my desk for a while and these guys came in, It was pretty cool since they were drinking the juice residue on the paper straw.