Prosena siberita
In 3 days ~10% in a week ~20%
Prosena siberita is a species of fly in the family Tachinidae. This species is present in most of Europe, Central Asia, Japan, Mongolia, China, Russia, Transcaucasia, India, Indonesia, Malaysia, Myanmar, Nepal, Philippines, Ryukyu Islands, Sri Lanka, Taiwan, Australia and New Caledonia. It has been introduced and established in United States. The earliest introduction occurred in 1925, when numerous specimens were released in New Jersey for the purpose of establishing a local population to combat the spread of the Japanese beetle.
Prosena siberita can reach a body length of 7.5–10.5 millimetres (0.30–0.41 in). These flies have a grey dusted, fuscous or testaceour body. In males the abdomen is largely testaceous, while in females it is fuscous, densely grey dusted. Thorax shows some yellowish hairs. They have a very long and slender proboscis that they keep hinged under the body. The length of the proboscis is longer than the height of the head. Palpi are highly reduced. Eyes are reddish-brown and bare. Femora are reddish. Wings are hyaline, yellowish-brown at the base.
Prosena siberita is a univoltine species. Adults are harmless... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Pyrénées National Park | 🇫🇷 France |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Warsaw | 🇵🇱 Poland | |
| 2 | Rotterdam [The Hague] | 🇳🇱 Netherlands | |
| 3 | Moscow | 🇷🇺 Russia |
Rare
Under 5% of wildlife watchers report a Prosena siberita sighting in Pyrénées National Park on a given day, based on 7 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 940th most-seen of the 1277 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.
August
In that month about 10% of wildlife watchers report a Prosena siberita in Pyrénées National Park on a given day, against under 5% in September to July, the lowest months.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Prosena siberita sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Pyrénées National Park, in our data
Pyrénées National Park is the only park on Wallace's Line with enough records to rate Prosena siberita sightings: under 5% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Prosena siberita is recorded against all the insects logged in Pyrénées National Park (7 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.
