Osmia bicolor
In 3 days ~10% in a week ~30%
Osmia bicolor, the two-coloured mason-bee, is a Palearctic species of bee in the genus Osmia. It is outstanding amongst other megachilid bees in that it nests in empty snail shells. Osmia bicolor females are small bees, 12 mm in length, with a black head and thorax and an abdomen covered in bright ginger hair. In the males the ginger colour of the abdomen is less intense.
Osmia bicolor is found in Europe and western Asia from southern Great Britain in the west east to Turkestan, it is found as far north as southern Scandinavia and Finland, and south as far as Spain and Romania. It occurs in grasslands and open deciduous woodland over calcareous soils underlain by rocks such as limestone and chalk.
Osmia bicolor is univoltine in western Europe and is among the first bees to emerge in the spring, males can be seen as early as February, although the normal flight period is from April to July. The females emerge a few weeks after the males and are quickly mated. Compared to females the males have a very short life. Once mated the female O. bicolor seeks out the empty shells of snails, In Britain it has been recorded using the... Wikipedia →
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More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Red-Tailed Mason Bee sighting in Prague on a given day, based on 17 verified sightings from GBIF citizen-science data. It is the 316th most-seen of the 724 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.
April
In that month about 10% of wildlife watchers report a Red-Tailed Mason Bee in Prague on a given day, against under 5% in May to March, the lowest months.
2nd of 3
Of the 3 cities where we can rate Red-Tailed Mason Bee sightings, Prague ranks 2nd at under 5%. The best odds are in Warsaw (Poland, about 10%).
Same genus: Osmia
The closest relatives of the Red-Tailed Mason Bee that you can see in Prague (genus Osmia, Mason Bees) are European Orchard Bee (about 10%) and Red Mason Bee (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Red-Tailed Mason Bee is recorded against all the insects logged in Prague (17 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.
