Thera britannica
In 3 days ~40% in a week ~60%
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 |
With luck
About 10% of wildlife watchers report a Spruce Carpet sighting in Snowdonia National Park on a given day, based on 20 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 106th most-seen of the 387 insects we can rate there. Over three days the chance rises to about 40%, and over a week to about 60%, if each day is a fresh chance.
November
In that month about 30% of wildlife watchers report a Spruce Carpet in Snowdonia National Park on a given day, against under 5% in December to March, 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.
Yes
Of the 2 parks where we can rate Spruce Carpet sightings, Snowdonia National Park has the highest daily chance: about 10%. Next come Cairngorms National Park (United Kingdom, about 10%).
Same family: Geometridae
The closest relatives of the Spruce Carpet that you can see in Snowdonia National Park (family Geometridae, Geometer Moths) are Brimstone Moth (about 30%), Small Phoenix (about 20%) and Peppered Moth (about 20%), 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 Snowdonia National Park (20 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.
