The waist can be made up of one or two small segments, depending on the species.
Ants are social insects living in colonies comprised of one or a few queens, and many workers.
The queen generally stays deep and safe within a nest. Most ants that you see are workers and these are all females. Depending on species, workers may be similar in size, or come in a range of sizes. Ants tend to come in dark or earth tones. Different species are black, earth-tone reds, pale tans, and basic browns.