There is an interesting account of the treatment of wounded Matabele ants (Megaponera analis) from the Ivory Coast by their nest-mates, after raids on termite mounds to feed on these insects (https://www.theguardian.com/science/2018/feb/14/nursing-in-nature-matabele-ants-observed-treating-injured-comrades). It appears that only potentially viable, but wounded ants, produce odours ('pheromones') that elicit retrieval by their comrades and, once located, are capable of adopting a posture facilitating their being carried back to the nest. There, they are cleaned (and possibly treated with antibiotics?) enabling around 80% of them to recover to fight again. This simple system essentially mirrors triage and paramedic treatment as practised by our own species.
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