I’m surprised they don’t just eject the injured worker from the colony. I wonder if there are specific tasks the amputated ant then goes on to do, or if they resume their former duties at a lower speed.
I'm going to hazard a speculative answer with poor evidence: love.
The ants love one another, as shown by their child-rearing, grooming, playing, the "antennating" mentioned in the article, collective defense, and deliberate handling of their dead.
We don't understand their language, but I have a certain faith that ants experience a very similar kinship for their sisters as we. If they were strictly-rational robots then why would they show these behaviors?
That could imply that maybe ants have some sort of disability benefits for those who have lost limbs.
> I’m surprised they don’t just eject the injured worker from the colony
Wonder if this has something to do due with space constraints. If the study was done in a controlled nest, it must be space bounded one way or another. Dynamics might change when in real-world?