Lasius brunneus
In 3 days ~10% in a week ~30%
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 Amsterdam on a given day, based on 5 verified sightings from GBIF citizen-science data. It is the 194th most-seen of the 234 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.
April–July and November
In those months about 10% of wildlife watchers report a Brown Tree Ant in Amsterdam on a given day, against under 5% in August–October and December–March, 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.
7th of 9
Of the 9 cities where we can rate Brown Tree Ant sightings, Amsterdam ranks 7th at under 5%. The best odds are in Warsaw (Poland, about 10%), London (United Kingdom, about 10%) and Brussels (Belgium, about 10%).
Same order: Hymenoptera
The closest relatives of the Brown Tree Ant that you can see in Amsterdam (order Hymenoptera, Ants, Bees, Wasps, and Sawflies) are Common Carder Bumble Bee (about 20%), Early Bumble Bee (about 10%) and Common European Yellowjacket (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 Amsterdam (5 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.
