Thera britannica
In 3 days ~10% in a week ~30%
The spruce carpet (Thera britannica) is a moth in the family Geometridae. The species was first described by Alfred Jefferis Turner in 1925. It is a double-brooded species, meaning it has two broods in one year. Its wings are coloured with different shades of grey, but the spring brood tends to have more brown colours. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Snowdonia National Park | 🇬🇧 United Kingdom | |
| 2 | Cairngorms National Park | 🇬🇧 United Kingdom |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Liverpool | 🇬🇧 United Kingdom | |
| 2 | Birmingham | 🇬🇧 United Kingdom | |
| 3 | London | 🇬🇧 United Kingdom | |
| 4 | Manchester | 🇬🇧 United Kingdom |
Rare
Under 5% of wildlife watchers report a Spruce Carpet sighting in London on a given day, based on 37 verified sightings from GBIF citizen-science data. It is the 568th most-seen of the 1504 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.
May and October
In those months about 10% of wildlife watchers report a Spruce Carpet in London on a given day, against under 5% in June–September and November–April, the lowest months.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Spruce Carpet sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
3rd of 4
Of the 4 cities where we can rate Spruce Carpet sightings, London ranks 3rd at under 5%. The best odds are in Liverpool (United Kingdom, about 10%) and Birmingham (United Kingdom, about 10%).
Same genus: Thera
The closest relatives of the Spruce Carpet that you can see in London (genus Thera) are Grey Pine Carpet (about 10%) and Cypress Carpet (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Spruce Carpet is recorded against all the insects logged in London (37 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.
