Batrachedra praeangusta
In 3 days ~10% in a week ~20%
Batrachedra praeangusta is a moth of the family Batrachedridae which is native to Europe. It is also found in North America. It was first described by Adrian Haworth in 1828 from the type specimen found in England. The foodplants of the larvae are poplars (Populus species) and willows (Salix species).
The moths have elongated narrow forewings with a wingspan of 14–15 mm. The forewings have a white background, with a mix of sooty black and paler colour and the hindwings are shining grey, becoming lighter towards the end.
The moth is univoltine (i.e. one generation a year) flying from mid-June to early-September, and can be found on tree trunks and comes to light. Eggs are laid on various species of poplar including aspen (Populus tremula), white poplar (Populus alba) and willows, such as goat willow (Salix caprea) and white willow (Salix alba). Probably on a twig.
The head of the larva is brown, lighter in front, while the colour of the body is from yellow-brown to darker brown with pale yellow spots and a broad white line. The prothoracic plate is dark brown and the anal plate is bright yellow. The larva take twenty days to develop and can... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Helsinki | 🇫🇮 Finland | |
| 2 | Saint Petersburg | 🇷🇺 Russia | |
| 3 | Moscow | 🇷🇺 Russia |
Rare
Under 5% of wildlife watchers report a Poplar Cosmet sighting in Saint Petersburg on a given day, based on 49 verified sightings from GBIF citizen-science data. It is the 139th most-seen of the 448 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.
July and August
In those months about 10% of wildlife watchers report a Poplar Cosmet in Saint Petersburg on a given day, against under 5% in September to June, the lowest months. Those are among Saint Petersburg's wettest months, with about 100 mm of rain a month against 40 mm in February.
Among the best
Of the 3 cities where we can rate Poplar Cosmet sightings, Saint Petersburg ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Helsinki (Finland, under 5%).
Same order: Lepidoptera
The closest relatives of the Poplar Cosmet that you can see in Saint Petersburg (order Lepidoptera, Butterflies and Moths) are Small Tortoiseshell (about 10%), European Peacock Butterfly (about 10%) and Red Admiral (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Poplar Cosmet is recorded against all the insects logged in Saint Petersburg (49 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.
