Rana arvalis
Silhouette: Sharp Photography, sharpphotography.co.uk · PhyloPic
In 3 days ~20% in a week ~40%
The moor frog (Rana arvalis) is a slim, reddish-brown, semiaquatic amphibian native to Europe and Asia. Moor frogs are known for their ability to freeze solid and survive thawing. The frog makes use of various cryoprotectants i.e. antifreeze that decrease its internal freezing temperature. The species is distributed over a large range, covering a significant portion of Eurasia. Male moor frogs are known to turn blue temporarily during the height of mating season. This coloration is assumed to signal a mate's fitness. Moor frogs typically mate through multimale amplexus, a form of polyandry.
The moor frog spawns its eggs in large batches in still bodies of acidic waters. Human-caused pollution is causing excessive acidification of habitat which harms egg health. The moor frog's habitat is also under destruction due to a variety of other anthropogenic means. The species has an IUCN listing of Least Concern. However, a majority of European states independently consider the conservation status of the moor frog to be unfavorable. The moor frog, like other members of Rana, is omnivorous and will consume anything that it can physically ingest.
The moor frog is a medium to... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Biebrza National Park | 🇵🇱 Poland | |
| 2 | Białowieża National Park | 🇵🇱 Poland | |
| 3 | Wadden Sea National Park | 🇩🇪 Germany |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Novosibirsk | 🇷🇺 Russia | |
| 2 | Yekaterinburg | 🇷🇺 Russia | |
| 3 | Helsinki | 🇫🇮 Finland | |
| 4 | Moscow | 🇷🇺 Russia | |
| 5 | Nizhny Novgorod | 🇷🇺 Russia | |
| 6 | Copenhagen | 🇩🇰 Denmark | |
| 7 | Berlin | 🇩🇪 Germany | |
| 8 | Saint Petersburg | 🇷🇺 Russia |
With luck
About 10% of wildlife watchers report a Moor Frog sighting in Helsinki on a given day, based on 14 verified sightings from GBIF citizen-science data. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
April–May and July–September
In those months about 10% of wildlife watchers report a Moor Frog in Helsinki on a given day, against under 5% in June and October–March, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Moor Frog sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 8 cities where we can rate Moor Frog sightings, Helsinki ranks 3rd at about 10%, level with the leaders once rounded. The best odds are in Novosibirsk (Russia, about 10%) and Yekaterinburg (Russia, about 10%).
GBIF citizen-science records
It is estimated from how often the Moor Frog is recorded against all the amphibians logged in Helsinki (14 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.
