Ants have been seen healing wounded trees—behavior that is believed to have never been observed before. When holes were drilled into Cecropia tree trunks, the ants emerged from their homes to patch up the wounds, significantly reducing the size of the holes within 2 1/2 hours and leaving them completely healed within 24 hours.

https://www.newsweek.com/azteca-ants-cecropia-trees-heal-wounds-symbiotic-panama-1666351