Mesembrina meridiana
In 3 days ~40% in a week ~60%
Mesembrina meridiana, sometimes known as the noon fly or noonday fly, is a species of fly in the family Muscidae. This common species is widespread in most of Europe, in the Near East, in the eastern Palearctic realm (Russia, Mongolia, China), and in North Africa.
Mesembrina meridiana can reach a length of 9–13 millimetres (0.35–0.51 in). These medium large flies have a stout body. Thorax and abdomen are shiny black, covered with uniform black hair. Numerous bristles are present on the edge of the scutellum. Occiput has no yellow hairiness. Eyes are bare and the cheeks under the eyes are covered with fine yellow short hairs. Orbits are separated by a wide black space. Antennae and palps are black, but arista is yellow. An orange colouration is present on the base of the wings, on the feet and the face.
This species can be easily confused with Mesembrina resplendens and Mesembrina intermedia. This species is ovoviviparous, as the eggs hatch prior or within an hour after deposition. The female lays up to five eggs in a lifetime, each one in a different pat, at two-day intervals. Eggs are laid in cow dung.
Adults can be found between... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Hohe Tauern National Park | 🇦🇹 Austria | |
| 2 | Vanoise National Park | 🇫🇷 France | |
| 3 | Pyrénées National Park | 🇫🇷 France | |
| 4 | Cairngorms National Park | 🇬🇧 United Kingdom | |
| 5 | Sierra de Guadarrama National Park | 🇪🇸 Spain | |
| 6 | Wadden Sea National Park | 🇩🇪 Germany |
With luck
About 10% of wildlife watchers report a Noon Fly sighting in Vanoise National Park on a given day, based on 11 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 149th most-seen of the 308 insects we can rate there. Over three days the chance rises to about 40%, and over a week to about 60%, if each day is a fresh chance.
October
In that month about 40% of wildlife watchers report a Noon Fly in Vanoise National Park on a given day, against under 5% in August–September and November–June, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Noon Fly sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 6 parks where we can rate Noon Fly sightings, Vanoise National Park ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Hohe Tauern National Park (Austria, about 10%).
Same order: Diptera
The closest relatives of the Noon Fly that you can see in Vanoise National Park (order Diptera, Flies) are Philipomyia aprica (about 20%), Common Drone Fly (about 10%) and Pellucid Hover Fly (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Noon Fly is recorded against all the insects logged in Vanoise National Park (11 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.
