Bombus ruderarius
In 3 days ~10% in a week ~20%
Bombus ruderarius, commonly known as the red-shanked carder bee or red-shanked bumblebee, is a species of bumblebee found in Eurasia. Though sometimes mistaken for Bombus lapidarius, Bombus ruderarius varies slightly in appearance from B. lapidarius in several ways. Bombus ruderarius is a relatively small bumblebee with a wide abdomen, an oblong face, and a fairly long tongue.
The queen has an average length of 17 mm (0.67 in) and a wingspan of 32 mm (1.3 in), while the other castes are somewhat smaller; the workers have an average length of 15 mm (0.59 in) and the males 13 mm (0.51 in). Their colour is prominently black, with a red tail; among males, however, a lighter form exists with yellow-green hairs on the thorax and the first two terga (abdominal segments). The corbicula (pollen basket) on the hind legs of females (queens and workers) is covered with yellow-red hair.
The nest is constructed of grass or moss, on or slightly below ground, and typically contains 50 to 100 workers. Often, old mouse nests in open grassland and scrubs are used. The species can, however, also appear in sparsely built-up urban areas as gardens and wasteland. Food sources... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Hohe Tauern National Park | 🇦🇹 Austria | |
| 2 | Pyrénées National Park | 🇫🇷 France |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Moscow | 🇷🇺 Russia |
Rare
Under 5% of wildlife watchers report a Red-Shanked Bumble Bee sighting in Moscow on a given day, based on 25 verified sightings from GBIF citizen-science data. It is the 486th most-seen of the 1111 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
In that month about 10% of wildlife watchers report a Red-Shanked Bumble Bee in Moscow on a given day, against under 5% in August to June, the lowest months. That is one of Moscow's wettest months, with about 95 mm of rain against 40 mm in February.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Red-Shanked Bumble Bee sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Moscow, in our data
Moscow is the only city on Wallace's Line with enough records to rate Red-Shanked Bumble Bee sightings: under 5% of wildlife watchers there report one on a given day.
Same genus: Bombus
The closest relatives of the Red-Shanked Bumble Bee that you can see in Moscow (genus Bombus, Bumble Bees) are Common Carder Bumble Bee (about 10%), 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 Red-Shanked Bumble Bee is recorded against all the insects logged in Moscow (25 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.
