Evergestis forficalis
In 3 days ~10% in a week ~30%
Evergestis forficalis, the garden pebble, is a species of moth of the family Crambidae. It is found in Europe, the Palearctic and North America. The species was described by Carl Linnaeus in his 1758 10th edition of Systema Naturae
The species closely resembles Rivula sericealis. The wingspan is 25–28 mm. The forewings are whitish-ochreous, disc and apex sometimes tinged with yellowish-brown; lines fine, dark brown, very obliquely curved, indented beneath costa, first very indistinct towards costa; two small transversely placed discal spots outlined with dark fuscous, lower larger; a dark fuscous oblique apical streak; margins of subterminal line obscurely brownish. The hindwings are ochreous- whitish with a grey posterior line.
The larva is yellowish-green; dorsal and lateral lines darker green; head yellowish The length of the forewings 12–14 mm. The moth flies from May to September depending on the location. The larvae feed on Brassicaceae species, such as Brussels sprout and kale. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cévennes National Park | 🇫🇷 France | |
| 2 | Pyrénées National Park | 🇫🇷 France | |
| 3 | Wadden Sea National Park | 🇩🇪 Germany |
Rare
Under 5% of wildlife watchers report a Garden Pebble sighting in London on a given day, based on 41 verified sightings from GBIF citizen-science data. It is the 505th 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–June and August
In those months about 10% of wildlife watchers report a Garden Pebble in London on a given day, against under 5% in July and September–April, the lowest months.
Between 10 pm and 1 am
Across all the parks we cover, that three-hour window holds the most Garden Pebble sightings with a recorded time, and about 7 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
2nd of 3
Of the 3 cities where we can rate Garden Pebble sightings, London ranks 2nd at under 5%. The best odds are in Liverpool (United Kingdom, about 10%).
GBIF citizen-science records
It is estimated from how often the Garden Pebble is recorded against all the insects logged in London (41 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.
