Thera britannica
In 3 days ~20% 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 |
With luck
About 10% of wildlife watchers report a Spruce Carpet sighting in Birmingham on a given day, based on 18 verified sightings from GBIF citizen-science data. It is the 358th most-seen of the 811 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 30%, if each day is a fresh chance.
April to June
In those months about 10% of wildlife watchers report a Spruce Carpet in Birmingham on a given day, against under 5% in July 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.
Among the best
Of the 4 cities where we can rate Spruce Carpet sightings, Birmingham ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Liverpool (United Kingdom, about 10%).
Same family: Geometridae
The closest relatives of the Spruce Carpet that you can see in Birmingham (family Geometridae, Geometer Moths) are Riband Wave (about 20%), Willow Beauty (about 20%) and Yellow Shell 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 Birmingham (18 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.
