Lasius brunneus
In 3 days ~10% in a week ~20%
Lasius brunneus is a species of ant in the genus Lasius. The species is widely distributed in Europe, from Sweden in the north to Anatolia in the south. In England this species is almost always found nesting in oak trees or rotting wood mainly foraging in trees but has also been found under stones and foraging on the ground. It is thought to be underrecorded but is fairly common especially in the South East.
Workers are easy to identify as they are bicoloured, but they can be confused with Lasius emarginatus. Nuptial flights have been recorded as early as May on warm days from early morning to early afternoon. Queens are smaller than other Lasius species, mainly a uniform dark brown colour with a flattish, slim appearance. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Pyrénées National Park | 🇫🇷 France |
More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Brown Tree Ant sighting in Vienna on a given day, based on 16 verified sightings from GBIF citizen-science data. It is the 724th most-seen of the 1406 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
May
In that month about 10% of wildlife watchers report a Brown Tree Ant in Vienna on a given day, against under 5% in June to April, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Brown Tree Ant sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
9th of 9
Of the 9 cities where we can rate Brown Tree Ant sightings, Vienna ranks 9th at under 5%. The best odds are in Warsaw (Poland, about 10%), London (United Kingdom, about 10%) and Brussels (Belgium, about 10%).
Same genus: Lasius
The closest relatives of the Brown Tree Ant that you can see in Vienna (genus Lasius, Citronella Ants, Fuzzy Ants, and Allies) are Central European Bicolored Ant (about 10%) and Jet Ant (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Brown Tree Ant is recorded against all the insects logged in Vienna (16 verified sightings), 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.
