Erynnis montanus
In 3 days ~10% in a week ~20%
Erynnis montana is a species of Palearctic butterfly in the family Hesperiidae (Pyrginae). It is found in China, eastern Russia (Amur), Taiwan and Japan. The larva feeds on Quercus mongolica. Wikipedia →
| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Mountainous Duskywing sighting in Tokyo on a given day, based on 22 verified sightings from GBIF citizen-science data. It is the 431st most-seen of the 1013 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.
March and April
In those months about 10% of wildlife watchers report a Mountainous Duskywing in Tokyo on a given day, against under 5% in May to February, the lowest months.
3rd of 3
Of the 3 cities where we can rate Mountainous Duskywing sightings, Tokyo ranks 3rd at under 5%. The best odds are in Seoul (South Korea, about 10%) and Nanjing (China, about 10%).
Same family: Hesperiidae
The closest relatives of the Mountainous Duskywing that you can see in Tokyo (family Hesperiidae, Skippers) are Common Straight Swift (about 20%), Small Branded Swift (about 10%) and Japanese Dart (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Mountainous Duskywing is recorded against all the insects logged in Tokyo (22 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.
