Meat ants, also known as gravel ants, are known for building large nests of layered gravel that span upwards of 650 meters and contain around 64,000 ants. The coolest thing about them, though, is that they have an affection for caterpillars. The meat ants protect their home against large predators by swarming them and overpowering them in large numbers - and they use this tactic to protect the neighborhood caterpillars, too. That's because the caterpillars secrete sugary fluids that help nourish the ants, as well as provide a sticky substance to help build their colony. In return, the ants provide these slow guys with an army of protection.
4. Honey badgers and honeyguide birds