Difficulty

Beginner-Intermediate. Crematogaster cerasi is a manageable Canadian native species that rewards keepers with highly distinctive, entertaining behaviour. The care requirements are straightforward, and the species tolerates minor husbandry errors reasonably well. It is an excellent choice for keepers who have some basic experience and want something visually different from more commonly kept ants.

Overview

Crematogaster cerasi, commonly known as the Cherry Acrobat Ant, is a small, shiny, reddish-brown to dark brown ant native to Eastern North America, including much of Canada. The species is immediately recognisable by its heart-shaped gaster — the rear segment of the abdomen — which sets it apart from virtually every other ant a keeper is likely to encounter.

Despite their small size, these ants are active, visible, and full of character. Colonies grow at a steady pace under good conditions and can eventually reach thousands of workers, making them a long-term project as well as an engaging beginner-to-intermediate species. Their natural range means they are well-adapted to Canadian seasonal rhythms and benefit from a winter cooling period.

Species Behaviour

The defining trait of Crematogaster cerasi is the acrobatic gaster-raising posture that gives the entire genus its common name. When workers feel threatened or are investigating a disturbance, they curl their heart-shaped gaster up and over the body in a striking display. This behaviour is not aggression — it is a defensive and communicative posture — and it occurs frequently enough that any keeper who watches their colony regularly will see it often.

Workers are fast-moving for their size and noticeably curious. They explore new outworld additions readily, forage with purpose, and interact visibly with one another. The colony does not hide away — workers are regularly visible at the surface of the nest and throughout the outworld, making Crematogaster cerasi an excellent display species. While not aggressive toward keepers, they will defend the nest if disturbed directly.

The combination of unique morphology, distinctive defensive behaviour, and constant visible activity makes this one of the more entertaining North American natives available to Canadian ant keepers.

Diet

Crematogaster cerasi requires both a liquid sugar source and small protein. For sugars, honey-water, sugar-water, or QNC Honey Nectar all work well. Protein should be appropriately sized for these small ants — fruit flies (both Drosophila melanogaster and D. hydei) are ideal, as are peanut beetle cultures and other small invertebrates. Larger prey items or feeder insects sized for bigger ant species are not suitable.

Feed in small amounts and remove any leftovers promptly. Crematogaster cerasi is sensitive to mould, and uneaten protein left in the outworld can quickly cause problems. A routine of small, frequent protein offerings is preferable to large, infrequent ones. Sugar sources can be refreshed every two to three days or as needed.

Founding Type

Crematogaster cerasi queens are fully claustral. After mating, the queen seals herself into a small founding chamber and raises her first workers entirely from her own metabolic reserves. She does not require food during this stage — only access to moisture. Keep the founding test tube hydrated and placed in a dark, quiet location. Avoid unnecessary disturbance during the founding period.

The queen will produce her first nanitic workers within several weeks. Once the first workers are active and foraging inside the test tube, small protein and sugar offerings can be introduced at the tube entrance. Transfer to a small formicarium setup once the colony has 10–20 workers and is clearly outgrowing the founding tube.

Colony Structure

Founding colonies are headed by a single queen. As the colony matures and reaches larger worker populations, Crematogaster cerasi may become polygynous — tolerating and incorporating additional queens into the established colony. This is a natural trait of the species and is not a sign of colony stress.

Early-stage colonies are headed by a single founding queen, so keepers should plan for single-queen husbandry at the outset. Polygyny, if it develops, tends to occur in more established colonies under natural conditions. For most keepers, a single founding queen raised through to a mature colony is the standard experience with this species.

Queen & Worker Sizing

Queens measure approximately 4–6 mm in length. Workers range from 2–4 mm. Crematogaster cerasi is a genuinely small ant, and this is an important consideration when selecting and setting up their housing. Gaps that would contain larger species will not contain these ants. All connections, outworld lids, and feeding ports should be checked carefully before introducing the colony.

The small size also means these ants are best observed in a well-lit setup where their movements and the characteristic gaster-raising display can be seen clearly. A quality modular formicarium with transparent components suits this species well.

Growth / Mature Colony Size

Crematogaster cerasi grows at a reasonable pace under good conditions. Early-stage colonies with a single founding queen develop steadily through the nanitic and small worker stages. As the colony establishes and worker numbers increase, growth accelerates. Mature colonies can reach several thousand workers, making this a rewarding long-term species.

Growth rate is positively influenced by consistent temperatures in the recommended range, regular feeding, appropriate moisture in the nest, and an annual winter cooling period. Colonies kept without diapause may continue to grow year-round but can show reduced long-term vigour over multiple seasons.

Diapause / Hibernation

A winter cooling period is beneficial for Crematogaster cerasi and is recommended for long-term colony health. As a temperate Canadian native, this species has evolved to experience cold winters, and replicating a seasonal cycle in captivity supports brood development and queen longevity.

Cooling should be gradual. Reduce temperatures slowly over several weeks in autumn, targeting a diapause temperature of approximately 10–15°C. Maintain cooling for 2–3 months, then gradually return to active temperatures in late winter or early spring. During diapause, the colony will become largely inactive. Minimal feeding is needed — keep moisture levels maintained and otherwise leave the colony undisturbed. Founding queens and very young colonies should not be cooled in their first winter; allow them to establish a small worker force first.

Temperature & Humidity

Active season temperatures of 22–27°C are appropriate for Crematogaster cerasi. The species does well at room temperature in most Canadian homes during the warmer months without supplemental heating. If ambient temperatures in your space fall below 20°C regularly, gentle under-tank heating or a heat cable set to the lower end of the range will support colony activity.

Maintain a humidity level of approximately 50–65% in the nest area, with a moisture gradient across the formicarium. Keep part of the nest substrate moist and allow a drier zone toward the outworld side. The founding test tube should have a moist cotton plug end and a dry air gap on the colony side. Avoid saturating the setup — excess moisture combined with food debris is the primary mould risk for this species.

Recommended Setup

Begin with the provided hydrated test tube setup for founding. The test tube is appropriately sized for a single founding queen and her first workers. Keep it dark and undisturbed until the first workers have eclosed and the colony is actively moving around inside the tube.

Once the colony has established a small worker population, transition to a small QNC modular formicarium paired with an outworld. Because Crematogaster cerasi is a small ant, ensure that the formicarium chambers, outworld, and all connection tubing are appropriately scaled. Standard large-format formicariums designed for bigger species may be too open and can make the colony difficult to observe. A compact, well-lit modular setup allows keepers to watch the ants' behaviour clearly, including the characteristic acrobatic gaster posture that makes this species so distinctive.

Escape prevention is important with this species given their small size. Inspect all gaps, lid seals, and connection points before introducing the colony. A thin layer of fluon or similar ant barrier product applied to the outworld walls is a practical precaution.

Best For

• Keepers who want a small, active Canadian native species with unique visual traits
• Those who enjoy observing ant behaviour and want a species that displays frequently and visibly
• Beginners who have completed their first colony and are ready for a slightly more involved species
• Keepers interested in building a Canadian native ant collection
• Anyone who wants a smaller species that is still full of personality and activity

Important Notes

• Small ant — carefully check all setup gaps, lid seals, and connection points before introducing the colony
• Keep the founding test tube properly hydrated; do not allow the cotton plug to dry out completely
• Provide a winter cooling (diapause) period of 2–3 months for long-term colony health; omit only for very new founding colonies in their first season
• Feed appropriately sized prey — fruit flies and peanut beetle cultures are ideal; avoid large feeder insects
• Remove uneaten protein promptly; this species is sensitive to mould
• Do not disturb the founding queen during the claustral stage

What's Included

• 1× Crematogaster cerasi queen or colony depending on selected variant
• 1× 16 × 125 mm hydrated test tube setup with cotton plug
• Protective bubble wrapping for shipping