Myrmica americana
Temperature
18–24 °C
Humidity
55–75%
Colony size
500–3,000
Queen size
5.5–7 mm
Worker size
4–5.5 mm
Hibernation temp
5 °C
Diet
Care Guide
Myrmica americana is a charming and moderately sized ant species native to North America, known for its lively foraging behavior and relatively modest colony size. The queen measures between 5.5 and 7 mm, while workers range from 4 to 5.5 mm, making them a compact but active species. Unlike some of their larger cousins, these ants do not display pronounced polymorphism — workers are fairly uniform in size, giving colonies a neat and orderly appearance. Founding is semi-claustral, meaning the queen must leave the nest to feed during the early stages, which adds an extra layer of engagement for the keeper.
In the wild, Myrmica americana is an opportunistic omnivore. Their diet consists primarily of small insects for protein, complemented by sugary liquids such as nectar or honeydew. In captivity, they thrive on a balanced menu of feeder insects like fruit flies, small crickets, or mealworm pieces, alongside sugar water or diluted honey. Protein is especially important during brood rearing, and a steady supply will help the colony grow steadily toward its maximum of several thousand workers. Unlike seed-collecting species, these ants have no need for dried grains, but they appreciate a varied diet to stay healthy and active.
Care difficulty
Keeping Myrmica americana is best suited for intermediate ant keepers. The semi-claustral founding requires patience and careful feeding during the first weeks, as the queen must hunt regularly while raising her initial workers. Once the colony is established, maintenance becomes more straightforward, but the need for regular protein feedings and attention to hibernation conditions means this species is not recommended for absolute beginners.
Housing
A formicarium with moderate humidity and good ventilation works well for Myrmica americana. Maintain humidity between 55 and 75 percent by periodically moistening the nesting substrate — these ants prefer slightly damp conditions without becoming waterlogged. Temperature should be kept between 18 and 24°C, avoiding extremes. A heating cable or mat is unnecessary unless your room is particularly cold. One of the most important requirements is a proper hibernation period: from late autumn through winter, the colony should be gradually cooled to around 5°C for several months. Without this seasonal rest, the queen may stop laying eggs and the colony’s health can decline.
First days after purchase
Upon receiving your Myrmica americana colony, place the formicarium in a quiet, dimly lit area and allow the ants to settle undisturbed for at least 24 hours. Check that the queen has access to food — offer a small insect and a droplet of sugar water near the entrance. Avoid bright lights and vibrations during the first week. Observe from a distance to ensure the workers are feeding the queen and that she is laying eggs. Once you see consistent activity, you can gradually introduce a regular feeding schedule. With a calm start, your Myrmica americana colony will soon become a rewarding window into the world of semi-claustral ant life.