Bombus sylvarum
In 3 days ~10% in a week ~30%
Bombus sylvarum, the shrill carder bee or knapweed carder-bee, is a species of bumblebee with a wide distribution across Europe, east to the Ural Mountains, and north to Great Britain, Ireland, and southern Scandinavia.
It is called the "shrill carder" because the pitch of its buzzing is more shrill than other bees and it is a carder bee – making its nest by carding material into a fabric. It is a small bumblebee; queens are 16–18 mm (0.63–0.71 in) long and female workers are 10–15 mm (0.39–0.59 in). It is mostly pale yellowish in colour with a black band across the thorax, two black bands across the abdomen, and an orange tip to the abdomen. It flies rapidly and queens produce a high-pitched buzz.
The flight period lasts from about April to September. The queen bee emerges from hibernation in the spring. She makes a nest on or slightly below the surface of the ground among open vegetation. An old mouse or vole nest may be used. By summer, the nest may contain around 100 worker bees. Each nest requires about 10 km2 (3.9 sq mi) of suitable habitat.
It occurs in herb-rich grassland where it feeds on nectar and pollen from a variety of flowers, especially... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Aigüestortes National Park | 🇪🇸 Spain | |
| 2 | Fertő-Hanság National Park | 🇭🇺 Hungary | |
| 3 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 4 | Pyrénées National Park | 🇫🇷 France |
Rare
Under 5% of wildlife watchers report a Shrill Carder-Bumble Bee sighting in Saint Petersburg on a given day, based on 26 verified sightings from GBIF citizen-science data. It is the 97th 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 30%, if each day is a fresh chance.
August
In that month about 10% of wildlife watchers report a Shrill Carder-Bumble Bee in Saint Petersburg on a given day, against under 5% in September to July, the lowest months. That is one of Saint Petersburg's wettest months, with about 100 mm of rain against 40 mm in February.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Shrill Carder-Bumble Bee sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
5th of 9
Of the 9 cities where we can rate Shrill Carder-Bumble Bee sightings, Saint Petersburg ranks 5th at under 5%. The best odds are in Warsaw (Poland, about 10%), Helsinki (Finland, about 10%) and Munich (Germany, about 10%).
Same genus: Bombus
The closest relatives of the Shrill Carder-Bumble Bee that you can see in Saint Petersburg (genus Bombus, Bumble Bees) are Tree Bumble Bee (about 10%) and Red-Tailed Bumble Bee (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Shrill Carder-Bumble Bee is recorded against all the insects logged in Saint Petersburg (26 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.
