Haematopota pluvialis
In 3 days ~10% in a week ~30%
The common horse fly (Haematopota pluvialis), also known as the notch-horned cleg fly, or simply cleg in Scotland and northern parts of Ireland, is a fly species belonging to the family Tabanidae subfamily Tabaninae. This species is present in most of Europe, in the Near East, and in the eastern Palearctic realm. It mainly lies in heath and moorland, and in spruce forest edge.
Common horse flies can reach a length of 5–11.5 millimetres (0.20–0.45 in), with a wingspan of 8–10 mm. This species has large compound eyes necessary for locating its prey. They are hairy and brightly colored, with stripes extended over most of the eye. In males, the eyes touch at the centre of the frons and the colored stripes are restricted to the lower part.
The first antennal segment is quite bulbous and has a strong sub-apical notch in the female. The thorax is grey, with black longitudinal stripes. The abdomen shows a dark background with a series of lateral pale spots and clearer bands at the end of each black segment. Also the wings have a distinctive pattern, being dark mottled by several clear spots. The legs are black, with yellowish-brown rings.
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| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Bavarian Forest National Park | 🇩🇪 Germany |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Moscow | 🇷🇺 Russia |
Rare
Under 5% of wildlife watchers report a Notch-Horned Cleg sighting in Bavarian Forest National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 964th most-seen of the 1115 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.
June and July
In those months about 10% of wildlife watchers report a Notch-Horned Cleg in Bavarian Forest National Park on a given day, against under 5% in August to May, the lowest months.
Between 5 and 8 pm
Across all the parks we cover, that three-hour window holds the most Notch-Horned Cleg sightings with a recorded time, and about 6 in 10 of them come between 6 pm and 6 am: it is most active around dawn and dusk.
Only Bavarian Forest National Park, in our data
Bavarian Forest National Park is the only park on Wallace's Line with enough records to rate Notch-Horned Cleg sightings: under 5% of wildlife watchers there report one on a given day.
Same order: Diptera
The closest relatives of the Notch-Horned Cleg that you can see in Bavarian Forest National Park (order Diptera, Flies) are Common Drone Fly (about 20%), Marmalade Hover Fly (about 20%) and Yellow-Haired Sun Fly (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Notch-Horned Cleg is recorded against all the insects logged in Bavarian Forest National Park (5 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.
