Acromyrmex coronatus
In 3 days ~20% in a week ~50%
Acromyrmex coronatus is a New World ant of the subfamily Myrmicinae found in the wild naturally from Guatemala to Brazil and Ecuador. Acromyrmex coronatus can be identified by the presence of median pronotal spines being usually present and distinct, occasionally reduced or absent, the head tapering behind eyes, and head width of less than or equal to 1.7 mm.
This montane species is tolerant of cold, wet conditions, and colonies can be found in small clearings and gaps in dense cloud forest. For example, on the north side of Volcan Barva, it has been found at 1100 m elevation, but not at 500 or 2000 m. On the Central Valley side, it has been collected at 1600 m at Zurqui. In the Monteverde area, it occurs in the community area, up to the highest ridges at 1700 m, and down to 800 m in the Penas Blancas Valley.
In Monteverde, it is the main pest in gardens, and enters houses at night to cut bread, cabbage, or fruit that has been left out. The nests are often in or under a piece of dead wood, and often with a superstructure of loose, dead leaf fragments. They do not excavate soil very extensively, if at all. They may be arboreal at times, nesting in low branch junctions of epiphyte-laden trees.
Acromyrmex coronatus foraging is continuous at night, but diurnal foraging only occurs after recent rain. Following a heavy rain, diurnal foraging commences, followed by a gradual cessation over a period of a day or two. Periodic rains during the dry season initiate a short bout of diurnal foraging, but when the rains became more continuous, diurnal foraging becomes continuous. Thus, the lack of diurnal foraging during the dry season is a short-term response to immediate environmental conditions and not a long-term change in colony foraging behavior.
Nuptial flights are common in Monteverde, and the distinctively patterned dealate queens are often seen on the roads. Dealate queens have been observed out cutting leaves, suggesting the queens need to forage themselves to establish a colony. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Monteverde Cloud Forest Reserve | 🇨🇷 Costa Rica |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Medellín | 🇨🇴 Colombia |
With luck
About 10% of wildlife watchers report an Acromyrmex coronatus sighting in Monteverde Cloud Forest Reserve on a given day, based on 25 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 123rd most-seen of the 506 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 50%, if each day is a fresh chance.
June
In that month about 20% of wildlife watchers report an Acromyrmex coronatus in Monteverde Cloud Forest Reserve on a given day, against under 5% in February, April and September–November, the lowest months.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Acromyrmex coronatus sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is most active around dawn and dusk.
Only Monteverde Cloud Forest Reserve, in our data
Monteverde Cloud Forest Reserve is the only park on Wallace's Line with enough records to rate Acromyrmex coronatus sightings: about 10% of wildlife watchers there report one on a given day.
Same family: Formicidae
The closest relatives of the Acromyrmex coronatus that you can see in Monteverde Cloud Forest Reserve (family Formicidae, Ants) are Hairy-Headed Leafcutter Ant (about 20%), Burchell's Army Ant (about 10%) and Tropical Carpenter Ant (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Acromyrmex coronatus is recorded against all the insects logged in Monteverde Cloud Forest Reserve (25 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
