Vespertilio murinus
Silhouette: Johann Christian Daniel von Schreber · PhyloPic
In 3 days ~10% in a week ~20%
The parti-coloured bat or rearmouse (Vespertilio murinus) is a species of vesper bat that lives in temperate Eurasia, from Western and Southern Europe, eastwards over the Caucasus and Iran into Afghanistan, northern Pakistan, Mongolia, north-east China, and Korea.
Their twittering call, similar to a bird's call, can be heard particularly in autumn during the mating season. The parti-coloured bat has a body size of 4.8–6.4 centimetres (1.9–2.5 in) with a wingspan of 26–33 cm (10–13 in), and a weight of 11–24 grams (0.39–0.85 oz). Its name is derived from its fur, which has two colours. Its back (dorsal side) is red to dark-brown, with silver-white-frosted hair. The ventral side is white or grey. The ears, wings and face are black or dark brown. The wings are narrow. The ears are short, broad and roundish. It is known to live up to 12 years.
These bats hunt for their prey, for example mosquitoes, caddis flies and moths, with a wide range of ultrasonic sounds, but especially around 25–27 kHz. They hunt after twilight at heights of around 20–40 metres (66–131 ft), for example in open landscape over streams and lakes and above forests or at street lights... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Warsaw | 🇵🇱 Poland | |
| 2 | Minsk | 🇧🇾 Belarus | |
| 3 | Novosibirsk | 🇷🇺 Russia | |
| 4 | Vienna | 🇦🇹 Austria | |
| 5 | Moscow | 🇷🇺 Russia |
Rare
Under 5% of wildlife watchers report a particolored bat sighting in Vienna on a given day, based on 7 verified sightings from GBIF citizen-science data. It is the 14th most-seen of the 16 mammals 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.
March, July and October–November
In those months about 10% of wildlife watchers report a particolored bat in Vienna on a given day, against under 5% in April–June, August–September and December–February, the lowest months.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most particolored bat sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
4th of 5
Of the 5 cities where we can rate particolored bat sightings, Vienna ranks 4th at under 5%. The best odds are in Warsaw (Poland, about 10%), Minsk (Belarus, about 10%) and Novosibirsk (Russia, about 10%).
GBIF citizen-science records
It is estimated from how often the particolored bat is recorded against all the mammals logged in Vienna (7 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.
