Tetramorium caespitum
Temperature
20–26 °C
Humidity
50–70%
Colony size
3,000–20,000
Queen size
6–8 mm
Worker size
2.5–3.5 mm
Hibernation temp
8 °C
Diet
Care Guide
Tetramorium caespitum, commonly known as the pavement ant, is a hardy and adaptable species that makes an ideal first colony for beginner ant keepers. The queen measures between 6 and 8 millimeters, while workers are notably smaller at 2.5 to 3.5 millimeters, creating a stark size contrast that is easy to observe. Unlike many other common ant species, Tetramorium caespitum shows no pronounced polymorphism—all workers are roughly the same size, which simplifies colony management and allows newcomers to focus on the fundamentals of ant keeping. These ants are claustral founders, meaning the queen seals herself inside a chamber after mating and raises her first brood entirely from stored body reserves, requiring no feeding during this initial phase.
One of the most appealing features of Tetramorium caespitum is its remarkably broad diet. In the wild, these ants are opportunistic omnivores, and in captivity they thrive on a varied menu that includes insects such as fruit flies or mealworms, sugar water, protein-rich foods, and even small seeds. This dietary flexibility makes feeding straightforward and forgiving—you will never be locked into a single food source. Their foraging behavior is enthusiastic but not aggressive; workers will actively explore their surroundings, collecting both prey and sweet liquids with equal gusto. As the colony grows, you can also offer crushed seeds, which they will process similar to how larger granivorous ants do, though on a smaller scale.
Care difficulty
Keeping Tetramorium caespitum is very easy and highly recommended for beginners. Their robust nature tolerates minor fluctuations in temperature and humidity, and they do not require live prey constantly—the occasional insect alongside a steady supply of sugar water or honey water is enough to maintain a thriving colony. Because they are claustral, the founding stage is low-stress; simply place the queen in a dark, undisturbed test tube setup with water and wait. Once workers appear, you can gradually introduce food and connect them to a small formicarium.
Housing
A standard formicarium with a humidity gradient works well for this species. Maintain the nest area at a humidity level between 50 and 70 percent, and keep the temperature in the range of 20 to 26 degrees Celsius. Tetramorium caespitum does not require extreme heat, and they are quite tolerant of cooler conditions as long as they remain within the recommended range. One critical aspect to note is that this species undergoes a genuine hibernation period. During winter, the colony should be cooled down to around 8 degrees Celsius for several months to mimic natural conditions. Without this dormant phase, the queen may fail to produce new workers in the following season. Before hibernation, ensure the colony is well-fed and has access to water, then gradually reduce the temperature.
First days after purchase
After receiving your Tetramorium caespitum colony, place them in a quiet, dimly lit location and allow at least 24 hours of undisturbed acclimation. Avoid tapping the container or checking on them too frequently. Ensure a clean water source is always available—either from a test tube reservoir or a water feeder—and offer a small drop of sugar water or honey water near the entrance. In the first week, observe from a distance to confirm the workers are foraging and the queen is calm. Once you see steady activity, you can very slowly start to open the nest for brief observations. With minimal stress and a little patience, your pavement ant colony will quickly settle in and begin its journey toward a population of several thousand hardy workers.