Colobopsis saundersi

Nuptial Flight Calendar

Flight months: Apr, May, Jun, Sep, Oct

Native to the humid lowland rainforests of Southeast Asia, Colobopsis saundersi is a canopy-dwelling ant that has earned its place among the most extraordinary social insects on Earth. Queens measure a robust 9 to 12 mm, while the polymorphic workers range from 5 mm in the smaller castes to a dramatic 10 mm in the heavily built major workers. A mature colony can house up to 10,000 individuals, a significant population for an arboreal nest. What really sets this species apart, however, is its unique defensive strategy. The major workers have evolved massively enlarged mandibular glands that run the length of their bodies; when threatened, they contract their abdominal muscles so violently that the cuticle ruptures, releasing a sticky, potentially toxic secretion over an intruder in an act of suicidal self-rupture, or autothysis. This astonishing behavior was brought into sharp focus by Laciny et al. (2018) in their work on the closely related Colobopsis explodens and has been meticulously documented by Davidson et al. (2012), who described the histology of the combat apparatus. Observing this species is a window into the sheer novelty of ant evolution, but it demands profound respect and a carefully managed environment.

Given its extreme sensitivity to environmental fluctuation and its specialized lifestyle, Colobopsis saundersi is unambiguously a species for expert keepers. This ant is not a candidate for a desktop novelty; it requires a keeper with a proven track record in maintaining demanding tropical, arboreal species, precise climate control, and an almost obsessive attention to detail. It is strictly an observational species—handling or even a sharp tap on the enclosure can trigger autothysis, wasting precious colony resources and potentially harming the queen. The reward lies in watching a colony meticulously seal its nest entrances with the flattened, plug-shaped heads of major workers (a behavior known as phragmosis) and in the rare, privileged glimpses of their foraging routines. If you have struggled to keep humidity-dependent species alive in the past, this ant will quickly expose every weakness in your setup. For the dedicated myrmecologist, however, it offers one of the most captivating displays of behavioral adaptation in the ant world.

Replicating the warm, saturated air of a Bornean rainforest is the single most critical aspect of housing. The nest must be arboreal in design, with a strong vertical orientation—plaster, cellular concrete, or cork tiles arranged to create narrow, branching chambers work well. A significant moisture gradient is non-negotiable; the lower nest chambers should remain consistently damp but never sodden, and the entire system requires a relative humidity band of 70 to 90 percent. Temperature should be held between 24 and 30 °C, ideally with a thermostat-controlled heat mat placed on one side to allow for thermal choice. Mist the interior of the outworld and nest daily, or better yet, integrate an automated misting system or a deep hydration layer of clay balls beneath the substrate. The outworld substrate can be a thin layer of coconut coir and sand, but its primary function is to provide a humid microclimate, not to absorb waste. Provide slender twigs, cork bark, and a few broad magnolia leaves as foraging surfaces, simulating the dappled light of the canopy. A tight-fitting lid with a fluon barrier is essential; these ants are agile climbers.

A balanced diet fuels both the colony’s growth and the costly production of the major workers’ defensive secretions. In the wild, Colobopsis saundersi forages for small arthropod prey and gathers carbohydrate-rich liquid resources such as extrafloral nectar and hemipteran honeydew. Offer pinhead crickets, flightless fruit flies, termites, and soft-bodied roach nymphs as proteins, ensuring all live prey is appropriately sized for the worker caste—overly large or aggressive feeders may injure workers. Carbohydrates should be supplied daily in the form of fresh sugar water, diluted honey, or slices of overripe mango and banana, placed on a small feeding dish or directly onto a leaf to avoid drowning. A constant source of clean water, either a test tube plugged with cotton or automatic waterer, must be available. Remove uneaten proteins within 24 hours to prevent fungal outbreaks. Cook (2008) suggests the metabolic investment in the autothysis apparatus is substantial, so a steady protein supply is vital for the production of major workers.

This is a tropical species that never experiences a cold season in its native range, so no diapause or hibernation period is required. The colony remains fully active year-round, and any sustained temperature drop below 24 °C will quickly induce stress, reduced brood production, and can trigger an alarmingly high rate of autothysis in major workers. Your heating and humidity regime must be consistent throughout the year, with only slight nightly temperature dips if any.

When you first receive your queen and her small founding cohort, patience is everything. Transfer the entire shipping container into the prepared nest setup without forcing a move; if the ants are in a test tube, simply place it inside the nesting area and let them discover the broader chambers at their own pace. Keep the environment dim, quiet, and stable for 48 hours before offering the first food—a tiny drop of honey water on a section of leaf and a single, freshly killed fruit fly will suffice. During this critical settling-in window, observe only with a red light and resist any temptation to nudge the colony. Watch for the queen to begin laying eggs and for the first workers to venture out; if they retreat instead, your humidity or temperature is likely off. Disturbance now can spell disaster, so allow several weeks of uninterrupted adjustment before any maintenance beyond topping up water and removing old food. With quiet dedication, you may slowly unlock the secrets of one of the ant world’s most astonishing living machines.