Stethophyma grossum
In 3 days ~20% in a week ~40%
The large marsh grasshopper (Stethophyma grossum) is a species of grasshopper belonging to the family Acrididae. The large marsh grasshopper was first described in the 10th edition of Systema Naturae, which was written by Swedish biologist Carl Linnaeus in 1758. Linnaeus considered all orthopteran insects to be members of the genus Gryllus, and gave the scientific name Gryllus grossus to this species. Later authors split the orthopterans into multiple genera, and the large marsh grasshopper would therefore be reclassified. French zoologist Pierre André Latreille moved the species into Acrydium in 1804, renaming it as Acrydium grossum, while French entomologist Jean Guillaume Audinet-Serville assigned it to Oedipoda in 1839 under the name Oedipoda grossa, and German entomologist Franz Xaver Fieber considered it a member of Mecostethus which he renamed as Mecostethus grossus in 1853. Later that year, German zoologist Leopold Heinrich Fischer published a book reviewing the orthopterans of Europe in which he determines that the large marsh grasshopper cannot be assigned to any existing genus. He therefore established the genus Stethophyma, of which this species was designated... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Białowieża National Park | 🇵🇱 Poland | |
| 2 | Aigüestortes National Park | 🇪🇸 Spain | |
| 3 | Pyrénées National Park | 🇫🇷 France | |
| 4 | Mercantour National Park | 🇫🇷 France | |
| 5 | Ecrins National Park | 🇫🇷 France | |
| 6 | Cévennes National Park | 🇫🇷 France | |
| 7 | Bavarian Forest National Park | 🇩🇪 Germany |
With luck
About 10% of wildlife watchers report a Large Marsh Grasshopper sighting in Cévennes National Park on a given day, based on 14 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 555th most-seen of the 996 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
July and August
In those months about 10% of wildlife watchers report a Large Marsh Grasshopper in Cévennes National Park on a given day, against under 5% in September to June, the lowest months. Those are among Cévennes National Park's driest months, with about 45 mm of rain a month against 260 mm in October.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Large Marsh Grasshopper sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
6th of 7
Of the 7 parks where we can rate Large Marsh Grasshopper sightings, Cévennes National Park ranks 6th at about 10%. The best odds are in Białowieża National Park (Poland, about 20%), Aigüestortes National Park (Spain, about 20%) and Pyrénées National Park (France, about 10%).
Same family: Acrididae
The closest relatives of the Large Marsh Grasshopper that you can see in Cévennes National Park (family Acrididae, Short-horned Grasshoppers) are Egyptian Bird Grasshopper (about 30%), Common Maquis Grasshopper (about 20%) and Woodland Grasshopper (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Large Marsh Grasshopper is recorded against all the insects logged in Cévennes National Park (14 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.
