Thera britannica
In 3 days ~10% in a week ~20%
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 Manchester on a given day, based on 5 verified sightings from GBIF citizen-science data. It is the 421st most-seen of the 458 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.
September and November
In those months about 10% of wildlife watchers report a Spruce Carpet in Manchester on a given day, against under 5% in October and December–August, 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.
4th of 4
Of the 4 cities where we can rate Spruce Carpet sightings, Manchester ranks 4th at under 5%. The best odds are in Liverpool (United Kingdom, about 10%), Birmingham (United Kingdom, about 10%) and London (United Kingdom, under 5%).
Same family: Geometridae
The closest relatives of the Spruce Carpet that you can see in Manchester (family Geometridae, Geometer Moths) are Riband Wave (about 20%), Willow Beauty (about 10%) and Garden 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 Manchester (5 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.
