A neat thing many people don’t know about ants is that the larvae actually contribute work of their own.
In most ants, the adults can’t fully digest their own food without first feeding it to one of the grubs for processing.
An adult worker will just trigger a regurgitation reflex in one of her baby sisters when she’s hungry.
The larvae are basically a “digestion caste.”
In some ants the larvae don’t even eat the food first; they have a pit on their belly where the food is placed, and they just spit up digestive enzymes all over themselves. When the meal is fully liquefied an adult will come by, ingest it, and then spit a little bit back into the baby’s mouth.
Then of course you have the ants who just feed on the larva’s blood, either by making a non-lethal incision or suckling at a little valve-like organ.
It’s like the grubs are their older sister’s disembodied stomachs.