Ants (Camponotus) engaging in trophallaxis up close

Ants engage in a food-sharing process called trophallaxis in which they discourage the contents of their "social stomach" directly into the mouthparts of their sisters.
Ants are famous for being preppers! They store up lots of food for times of famine, but keeping all that organic matter in a dark moist nest is a recipe for mold and that's no good.
To get around this problem, many species have specialized members of their colonies who act as living storehouses for sugar and other food materials. Some reach very large sizes and look like they're ready to pop! Some people even eat these as a sugary sweet!
The individuals you see here are exchanging with one of a kind of replete member, who also acts as a nurse for the young. These are captive Camponotus of a very large variety, I believe they may be Camponotus herculeanus. They are seen here through the glass of their test-tube nest, so the quality isn't great.