The term FORMICARY INHABITANT can be solved by the three letter word ANT. Ants are a type of social insect that live in colonies and are known for their organized behavior. They are found in many different habitats around the world and are one of the most successful species on the planet. Ants are an important part of the ecosystem, providing food for other animals and helping to break down organic matter. They are also a major agricultural pest, damaging crops and causing economic losses.