The term THEM INSECTS can be broken down into two crossword solutions: ANTS (4 letters). Ants are a type of insect that belong to the family Formicidae. They are one of the most diverse and successful groups of insects, with over 12, 000 species worldwide. Ants are social insects, living in colonies that can range from a few dozen to millions of individuals. They are known for their complex behaviors, such as their ability to communicate with each other and their use of pheromones to mark trails.