Formica obscuripes
In 3 days ~10% in a week ~30%
Formica obscuripes, the western thatching ant, is a species of ant in the family Formicidae. It is native to North America. It builds large mounds covered by small pieces of plant material. The number of adult workers per colony may reach up to 40,000. F. obscuripes feeds on various insect species, consumes nectar from homopterous insects they tend, and occasionally consumes plant tissue.
F. obscuripes creates distinctive dome-shaped mounds composed of varying materials found in the surrounding environment, primarily vegetation. The building material is commonly called "thatch". The mounds are typically constructed in areas devoid of cover, so that the nest is exposed to sunlight. The size of the mounds is highly variable, and is mostly determined by the age and health of the colony; they generally range in height from 1 to 18 inches (2.5–46 cm), although taller ones are not uncommon. A colony can also extend as much as 4 ft (1.2 m) below ground level, with chambers present in both the thatched mound and the soil. The thatched mound is in a constant state of change as it is affected by the environment and the ants keep repairing and modifying it.
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| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Olympic National Park | 🇺🇸 United States | |
| 2 | Great Bear Rainforest | 🇨🇦 Canada |
Rare
Under 5% of wildlife watchers report a Western Thatching Ant sighting in Great Bear Rainforest on a given day, based on 8 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 178th most-seen of the 235 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
March
In that month about 20% of wildlife watchers report a Western Thatching Ant in Great Bear Rainforest on a given day, against under 5% in June–August and October–February, the lowest months.
Between 1 and 4 pm
Across all the parks we cover, that three-hour window holds the most Western Thatching Ant sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
2nd of 2
Of the 2 parks where we can rate Western Thatching Ant sightings, Great Bear Rainforest ranks 2nd at under 5%. The best odds are in Olympic National Park (United States, about 10%).
GBIF citizen-science records
It is estimated from how often the Western Thatching Ant is recorded against all the insects logged in Great Bear Rainforest (8 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.
