Bibio articulatus
In 3 days ~10% in a week ~20%
Bibio articulatus is a species of march fly in the family Bibionidae. Its distinctive features are its dark exoskeleton that varies from black to a deep red, and red/orange legs. B. articulatus' wingspan is on average ~6 mm. Their femora and tibiae are both colored orange or red, with both inner and outer foretibial spurs the same length, and the foretibia colored brown. Their bodies are black with females having a colored thorax. They have lightly colored posterior wing veins compared to other species.
Bibio articulatus is most commonly found in the United States, east of the Rocky Mountains, all the way to the coast. Bibio articulatus can be found usually in rotting trees, or eating the leaves of plants without causing significant damage. It is also found in loose soil during its reproductive cycles.
The sexual dimorphism in Bibio articulatus is mainly limited to eye size and body size, but has a few other varying traits. Male red-legged March flies have eye formations that are dramatically larger and take up most of the head, while females have small eyes that sit on the side of the head; although females are often... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Philadelphia | 🇺🇸 United States | |
| 2 | Washington | 🇺🇸 United States | |
| 3 | Boston | 🇺🇸 United States | |
| 4 | Toronto | 🇨🇦 Canada | |
| 5 | New York City | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Bibio articulatus sighting in Philadelphia on a given day, based on 12 verified sightings from GBIF citizen-science data. It is the 352nd most-seen of the 632 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.
April
In that month about 10% of wildlife watchers report a Bibio articulatus in Philadelphia on a given day, against under 5% in May to March, the lowest months.
Yes
Of the 5 cities where we can rate Bibio articulatus sightings, Philadelphia has the highest daily chance: under 5%. Next come Washington (United States, under 5%) and Boston (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Bibio articulatus is recorded against all the insects logged in Philadelphia (12 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.
