Their common name velvet ant refers to their dense pile of hair which most often is bright scarlet or orange, but may also be black, white, silver, or gold. Black and white specimens are sometimes known as panda ants due to their hair coloration resembling that of the giant panda. Their bright colors serve as aposematic signals. They are known for their extremely painful stings, hence the common name cow killer or cow ant. Unlike real ants, they do not have drones, workers, and queens. However, velvet ants do exhibit haplodiploid sex determination similar to other members of the Hymenoptera, including Vespoidea.