A new study has shown that wood ants are making an antibiotic mixture made from tree resin and poison from their own bodies. This mixture has been found to prevent fungus growth and protect the colony from diseases. Maybe the ants solution can help with our problem with antibiotic resistance. http://www.sciencemag.org/news/2017/03/chemist-ants-brew-antibiotic-cocktail-protect-their-colony

You'd think that living in a colony of army ants would be a very dangerous thing for a beetle, however this species has changed it's body shape, behavior and pheromone chemistry to remain undetected by the ants. Once accepted as part of the colony, the beetle will start to feed on the ant brood. https://www.sciencedaily.com/releases/2017/03/170309132253.htm