Chrysops relictus
In 3 days ~10% in a week ~30%
Chrysops relictus, the twin-lobed deerfly, is a largish European and Asian deerfly of about 8–10.5 millimetres (0.31–0.41 in) length. The larvae feed upon organic matter in damp soils, and are termed hydrobionts in that they inhabit areas of high water content. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Wadden Sea National Park | 🇩🇪 Germany | |
| 2 | Pyrénées National Park | 🇫🇷 France |
With luck
About 10% of wildlife watchers report a Twin-Lobed Deer Fly sighting in Amsterdam on a given day, based on 7 verified sightings from GBIF citizen-science data. It is the 170th 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.
June to August
In those months about 10% of wildlife watchers report a Twin-Lobed Deer Fly in Amsterdam on a given day, against under 5% in September to May, the lowest months.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Twin-Lobed Deer Fly sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 5 cities where we can rate Twin-Lobed Deer Fly sightings, Amsterdam has the highest daily chance: about 10%. Next come Kyiv (Ukraine, under 5%) and Helsinki (Finland, under 5%).
Same order: Diptera
The closest relatives of the Twin-Lobed Deer Fly that you can see in Amsterdam (order Diptera, Flies) are Common Drone Fly (about 30%), Marmalade Hover Fly (about 20%) and Hornet Mimic Hover Fly (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Twin-Lobed Deer Fly is recorded against all the insects logged in Amsterdam (7 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.
