Osmia bicornis
In 3 days ~50% in a week ~80%
Osmia bicornis (synonym Osmia rufa) is a species of mason bee, and is known as the red mason bee due to its covering of dense gingery hair. It is a solitary bee that nests in holes or stems and is polylectic, meaning it forages pollen from various different flowering plants. These bees can be seen aggregating together and nests in preexisting hollows, choosing not to excavate their own. These bees are not aggressive; they will only sting if handled very roughly and are safe to be closely observed by children. Females only mate once, usually with closely related males. Further, females can determine the sex ratio of their offspring based on their body size, where larger females will invest more in diploid females eggs than small bees. These bees also have trichromatic colour vision and are important pollinators in agriculture.
This species is part of the order Hymenoptera, which consists of bees, wasps, ants, and sawflies, and a member of the family Megachilidae, which mostly consists of solitary bees, and is among 11 species of Osmia identified in Britain. O. bicornis is the current scientific name for this bee, although it was formerly known as O. rufa... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 2 | Snowdonia National Park | 🇬🇧 United Kingdom | |
| 3 | Wadden Sea National Park | 🇩🇪 Germany |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Birmingham | 🇬🇧 United Kingdom | |
| 2 | Warsaw | 🇵🇱 Poland | |
| 3 | Liverpool | 🇬🇧 United Kingdom | |
| 4 | London | 🇬🇧 United Kingdom | |
| 5 | Manchester | 🇬🇧 United Kingdom | |
| 6 | Berlin | 🇩🇪 Germany | |
| 7 | Helsinki | 🇫🇮 Finland | |
| 8 | Hamburg | 🇩🇪 Germany | |
| 9 | Copenhagen | 🇩🇰 Denmark | |
| 10 | Cologne | 🇩🇪 Germany |
Possible
About 20% of wildlife watchers report a Red Mason Bee sighting in Birmingham on a given day, based on 192 verified sightings from GBIF citizen-science data. It is the 48th most-seen of the 811 insects we can rate there. Over three days the chance rises to about 50%, and over a week to about 80%, if each day is a fresh chance.
April
In that month about 40% of wildlife watchers report a Red Mason Bee in Birmingham on a given day, against under 5% in July to February, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Red Mason Bee sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 28 cities where we can rate Red Mason Bee sightings, Birmingham has the highest daily chance: about 20%. Next come Warsaw (Poland, about 20%) and Liverpool (United Kingdom, about 20%).
GBIF citizen-science records
It is estimated from how often the Red Mason Bee is recorded against all the insects logged in Birmingham (192 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.
