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{{Taxobox
| name = Parti-coloured bat
| status = LC
| status_system = iucn3.1
| status_ref =  <ref name="IUCN"/>
| image = Vespertilio murinus 2.jpg
| regnum = [[Animalia]]
| phylum = [[Chordata]]
| classis = [[Mammalia]]
| ordo = [[Chiroptera]]
| familia = [[Vespertilionidae]]
| genus = ''[[Vespertilio]]''
| species = '''''V. murinus'''''
| binomial = ''Vespertilio murinus''
| binomial_authority = [[Carl Linnaeus|Linnaeus]], [[10th edition of Systema Naturae|1758]] <ref>{{cite book |author=Carl Linnaeus |author-link=Carl Linnaeus |title=Systema naturæ per regna tria naturæ, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Tomus I |year=1758 |edition=[[10th edition of Systema Naturae|10th]] |publisher=Laurentius Salvius |location=Stockholm |page=32 |url=http://www.biodiversitylibrary.org/item/80764#page/42/mode/1up |language=Latin}}</ref>
| range_map = Vespertilio murinus range map.png
| range_map_caption = Range of ''V. murinus'' in Eurasia
| synonyms = ''Eptesicus murinus'' <small>(Linnaeus, 1758)</small>
| synonyms_ref =  <ref>{{cite web |url=http://www.nhm.ac.uk/research-curation/scientific-resources/biodiversity/uk-biodiversity/uk-species/species/vespertilio_murinus.html |title=''Vespertilio murinus'' Linnaeus, 1758 - Parti-Coloured Bat |publisher=[[Natural History Museum, London|Natural History Museum]] |accessdate=16 December 2014}}</ref>
}}
The '''parti-coloured bat''' or '''rearmouse''' (''Vespertilio murinus'') is a species of [[vesper bat]] that lives in [[temperate]] [[Eurasia]].

== Description ==
Their twittering call, similar to a bird's call, are to be heard particularly in the autumn during the mating season. The parti-coloured bat has a body size of {{convert|4.8|-|6.4|cm}} with a wingspan of {{convert|26|-|33|cm|abbr=on}}, and a weight of {{convert|11|-|24|g}}.<ref>{{cite web |url=http://www.bats.org.uk/publications_download.php/749/raritiesvagrants.pdf |title=Rarities and vagrants |publisher=[[Bat Conservation Trust]] |format=[[Portable Document Format|PDF]] |accessdate=16 December 2014}}</ref> 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. The highest known age is 12 years.

== Behaviour ==
These bats hunt for their [[prey]], for example [[mosquito]]es, [[caddis flies]] and [[moth]]s, with a wide range of ultrasonic sounds, but especially around 25–27 kHz.<ref>{{cite journal |author=Maja Zagmajster |year=2003 |title=Display song of parti-coloured bat ''Vespertilio murinus'' Linnaeus, 1758 (Chiroptera, Mammalia) in southern Slovenia and preliminary study of its variability |journal=[[Natura Sloveniae]] |volume=5 |issue=1 |pages=27–41 |url=http://web.bf.uni-lj.si/bi/NATURA-SLOVENIAE/pdf/NatSlo_5_1_3.pdf |format=[[Portable Document Format|PDF]]}}</ref> They hunt after twilight at heights of around {{convert|20|-|40|m}}, for example in open landscape over streams and lakes and above forests or at street lights.<ref>{{cite web |author=S. M. Swift |year= |title=Bat species in Scotland |url=http://www.snh.gov.uk/docs/C208532.pdf |format=[[Portable Document Format|PDF]] |publisher=[[Scottish Natural Heritage]] |accessdate=16 December 2014}}</ref> In cold weather, the bat may remain in its resting place.

There is not much known about the behaviour of parti-coloured bats, as they are quite rare. Female bats live in small groups, of about 50 animals, sometimes up to several hundred adult females. In Western Europe, male groups consist of about 250 animals and are found only during the spring and early summer. These bats migrate, and flights of up to {{convert|900|km}} were found. The furthest migration was determined at {{convert|1780|km|abbr=on}}.<ref name="IUCN">{{IUCN |id = 22947 |taxon =''Vespertilio murinus'' |assessor=A. M. Hutson |assessor2=F. Spitzenberger |assessor3=S. Aulagnier|assessor4=I. Coroiu |assessor5=M. Stubbe|assessor6=J. Ariunbold |assessor7=V. Buuveibaatar|assessor8=S. Dorjderem |assessor9=T. Monkhzul|assessor10=M. Otgonbaatar |display-assessors=etal |year=2008 |version=2014.3 |accessdate=16 December 2014}}</ref>

Between October and March, the bats [[hibernation|hibernate]]. They hibernate alone, and can bear temperatures down to {{convert|-5|C|F}}.<ref name="Haarsma_Siepel">{{cite web |author=Anne-Jifke Haarsma |author2=Henk Siepel |last-author-amp=yes |year=2013 |title=Macro-evolutionary trade-offs as the basis for the distribution of European bats |journal=[[Animal Biology (journal)|Animal Biology]] |volume=63 |issue=4 |pages=451–471 |url=http://www.batweter.nl/index.php/component/attachments/download/35 |format=[[Portable Document Format|PDF]]}}</ref>

=== Reproduction and birth ===
Females form maternity roosts during May and July and generally give birth to twins.<ref name="Haarsma_Siepel"/> After the pups are weaned, which takes less than six weeks,<ref name="Haarsma_Siepel"/> females leave the maternity roost. Birth of the young is in western Europe around beginning of June.

==Distribution==
The parti-coloured bat occurs in Central and Western [[Europe]] and in [[Asia]]. Its natural habitat is mountains, [[steppe]]s and forested areas, but in Western Europe, they can mainly be found in cities. The species is protected, as it is threatened by [[insecticide]]s and changes in their habitat.

== References ==
{{reflist|32em}}

{{Vespertilioninae nav}}

[[Category:Vesper bats]]
[[Category:Bats of Asia]]
[[Category:Bats of Europe]]
[[Category:Mammals of Russia]]
[[Category:Mammals of Kazakhstan]]
[[Category:Mammals of Turkey]]
[[Category:Mammals of Azerbaijan]]
[[Category:Mammals of Uzbekistan]]
[[Category:Mammals of Turkmenistan]]
[[Category:Mammals of the Middle East|Bat, Parti-coloured]]
[[Category:Mammals of Afghanistan]]
[[Category:Mammals of Kyrgyzstan]]
[[Category:Mammals of Tajikistan]]
[[Category:Mammals of Pakistan]]
[[Category:Animals described in 1758]]

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Tom.Reding: Fix :Category:CS1 maint: Uses authors parameter: vauthors/veditors or enumerate multiple authors/editors/assessors; WP:GenFixes on, enum'd 1 author/editor WL, using AWB