Field ants are one of the most diverse types of ants in the world, boasting over 150 species worldwide. Also called mound ants, wood ants and thatching ants, these insects subsist primarily off of a sweet substance known as honey-dew, derived from insects such as mealy bugs and aphids. Field ants can vary widely in coloration with yellow, red, black and bi-colored red and black combinations all known to exist. These insects can be found throughout the United States.