Chesias isabella
In 3 days ~10% in a week ~30%
Chesias isabella is a moth of the family Geometridae. It was described by Schawerda in 1915. It is found in France, Spain and Portugal. The wingspan is 36–39 millimetres (1.4–1.5 in). There is one generation per year with adults on wing from May to July. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sierra de Guadarrama National Park | 🇪🇸 Spain |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Porto | 🇵🇹 Portugal |
Rare
Under 5% of wildlife watchers report a Chesias isabella sighting in Sierra de Guadarrama National Park on a given day, based on 11 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 300th most-seen of the 597 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.
April and May
In those months about 10% of wildlife watchers report a Chesias isabella in Sierra de Guadarrama National Park on a given day, against under 5% in June to March, the lowest months.
Between midnight and 3 am
Across all the parks we cover, that three-hour window holds the most Chesias isabella sightings with a recorded time, and about 8 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
Only Sierra de Guadarrama National Park, in our data
Sierra de Guadarrama National Park is the only park on Wallace's Line with enough records to rate Chesias isabella sightings: under 5% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Chesias isabella is recorded against all the insects logged in Sierra de Guadarrama 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.
