This[0,1] article suggests ants communicate by vomiting chemicals into each other's mouths. [0] https://www.livescience.com/ants-vomit-to-form-social-bonds htt

This[0,1] article suggests ants communicate by vomiting chemicals into each other's mouths. [0] https://www.livescience.com/ants-vomit-to-form-social-bonds https://www.livescience.com/ants-vomit-to-form-social-bonds [1] https://elifesciences.org/articles/20375.pdf https://elifesciences.org/articles/20375.pdf