Due to the increased interest for bats in Norway NIFF was founded during May 1997. The objectives of NIFF are to:

      ● map and monitor bat populations,
      ● work with measures enhancing the protection of bats and their environment,
      ● distribute information to the general public and management authorities.

Today NIFF contain around 207 members and 7 regional bat groups. The members have a wide background, and include school  children, teachers, house owners, management, librarians, translators, students and scientists. We publish a bulletin named Gudnjoloddi which is published biannual between seasons (spring and fall, with English abstracts) and a newsletter named Leðrblaka Express (In Scandinavian). Several bat groups have their own internal newsletters.

Fennoscandian Bats contains information on bats, bat research and management in Fennoscandia and Denmark. It is published bi-anually in English. The newsletter is available free upon subscription. Older numbers are made available on our web-page.

Do you wish to join us or give us bat observations sampled in one of the Nordic countries, please do not hesitate to contact us.




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  Last updated documents:
31. January 2020 (main page)
30. January 2020 (main page)
26. January 2019 (Fennoscandian Bats)

Recent News
Nordic bats and bat related research

Friday 31 January 2020

11th European Bat Detector Workshop to be organized in Finland 2020
The European Bat Detector Workshop was first organized in the Netherlands during 1991. Since, this workshop has been organized in connection to the European Bat Research Symposium (either just before, or after). This year the 15th European Bat Research Symposium will be organized in Turku during 3-7 August (check our meeting calender at www.batlife.info/meetings/).
So it is the pleasure of the Nordic Chiroptera Information Center (NIFF)  to invite you to the 11th European Bat Detector Workshop, which will be organized in Kausala, 133 km east of Helsinki.
      The five day (four night) workshop will include peer-reviewed oral presentations, posters, workshops, and sessions for exchanging experience in field practices.

      The aim of the workshop is to get field training in practical bat work, especially the use of various models of both passive and active bat detectors. This will improve our training and knowledge of the latest technology and experience on field identification of flying bats. The mixture of novice and well experienced bat workers (and everything between) enhances the learning process by self awareness and development.
For more information check our web site www.ebdw.eu.



An Anabat passive detector with weather box.

Thursday 30 January 2019

Nathusius Pipistrell migrate accross Kvarken to Sweden during fall
In recent years, researchers have assumed that the Nathusius Pipistrell, migrate across Kvarken from Finland to Sweden during fall. Now they found evidence by radio tracking.
      The life of mammals in Finland is generally well documented, but the bats constitute an exception. The biologists recently solved a riddle since they had to confirm that the Nathusius Pipistrell migrate accross Kvarken to Sweden during the fall. Their flight route goes via the Valsörarna to Holmögadd.
      The researchers have investigated migrating bats at Valsörarna's Biological Station for five years. By capturing Nathusius Pipistrell and attaching a small radio transmitter to them, it has been possible to document the migration route. Nathusius Pipistrell are no larger than a matchbox and they only weigh 5–10 grams, but they move 2,000 kilometers to winter in Western Europe, says Metsähallitus.
      More information can be found in the next issue of Fennoscandin Bats and Gudnjoloddi.



Trollpipistrell. Foto: Francois Schwaab.

11 November 2018

Indre Fosen municipality reported to Police and Norwegian Food Safety Authority according to law on animal welfare
A message of concern is forwarded to Police and the District Veterinarian (
Norwegian Food Safety Authority) since the municipality is planning on demolishing buildings at Handelsbakken, in Stadsbygd, Rissa. At one of these buildings there have been recorded emerging bats, and it is unknown if the bats still occupy the building. The law on animal welfare (Dyrevelferdsloven) state in § 5 that «Any person who believe that animals are exposed to abuse or serious destruction of environment, supervision and care, shall as urgently as possible alert the Norwegian Food Safety Authority or Police.»
      NIFF have contacted a number of persons in the municipality, but it is case worker Stian Fallrø at the planning department who make decisions concerning inspection of the buildings involved for demolition. NIFF sent an application on 26 June to survey the building for bats, and 138 days later (4,5 months) a reply has still not been received. Therefore, the Parliamentary Ombudsman have been contacted to force the municipality to reply.

      Indre Fosen municipality is already known for the colony of Whiskered Bats (Myotis mystacinus) located in Hoven old school building. At Hoven a number of laws and regulations were ignored in connection to the improvement of the road between Vanvikan and Leksvik. All vegetation around the colony was removed for several hundred meters, and the landscape changed, all with the blessing of the municipality. This is the most serious environmental crime committed on bats in Norway during recent years. This colony is the northern most known maternity roost in Norway, and maybe in the whole world.





10 October 2018

NIFF initiates an audit of the administration to Mære church and Dalen chapel (Romerike, Norway)
On 6. July NIFF discovered that a large portion of the trees on the edge of Mære church (Enebakk municipality) were removed to the north towards the river and west (towards the golf court. In a conversation with the church administration it was revealed that the motivation was to make the church more visible in the landscape, making it more apparent for the golfers. However, this church has hosted a colony of Brown Long-eared Bats since the mid 1990's, or longer.
      Furthermore, another church was also discovered during 9 October where all the church yard trees had been removed. Dalen chapel had a large stands of trees belonging to several species, leaving behind an open area with no taller vegetation. This church also had a colony of Brown Long-eared Bats for several decades.
      A well established fact is that Long-eared Bats are dependent on vegetation between the church and its foraging sites, since the bat only flies after dark in the cover of vegetation. These two churches are located in Enebakk and Fet municipalities, on each side of the lake Øyeren, just east of Oslo.
      Using public access laws and the Aarhus convention allowing access to environmental information, NIFF is now staring an audit to reveal what really happened and who is responsible. If any laws were broken, NIFF will recommend to the local police that the responsible people will be prosecuted.



16 September 2018

Phenology stations diploid
Today most of the phenology stations were diploid. These are AnaBat Express detectors which register fall activity of foraging bats as the season becomes more unfavourable for insect prey, forcing the bats to hibernate. The detectors are located in Norway and Sweden. Unfortunately our economy didn't allow us to deploy the Danish stations. We hope for the future to involve more local bat workers to deploy and service our detectors. In addition to the phenology stations covering foraging habitats, a detector has been placed at Romsås in Oslo. This station register Parti-colored Bats during the start of the display season which lasts from September till December.


10 September 2018

Help line with record high of phone calls concerning bats in distress
This summer we reached a record high of phone calls from people who found bats in distress. Most of the calls refer to juveniles which just learned to fly. We always ask for pictures of the bats, since they give valuable information on species identification and age.





3 September 2018

Double standards concerning management of bats at Sørum visiting ranch (Leira)
Sørum Fritidsgård is a riding school owned and managed by Skedsmo municipality, located just outside Lillestrøm. Some parts of the ranch property is preserved as a nature reserve, while other parts are designated as areas of recreation. The areas are located next to the oxbow lake Stilla, which is a part of the riverplains of Leira.
      The area contains a high species diversity of bats, including high numbers of foraging Parti-colored Bats, Northern Bats, and Norway's hot spot for Noctules. This area was also visited this August during the evening trips to the 3rd European Alpine Bat Detector Workshop.
      A number of bat boxes have been hung up in the forest connected to the Sørum ranch. Sørum Fritidsgård have also posted a board, informing the importance of the bat boxes since they replace the lack for roost trees in the area. However, Sørum Fritidsgård just removed a huge birch and a number of aspen trees just a few meters from the poster, informing that trees are important to bats. These trees were just reaching an age and dimension making it possible for birds, bats and other animals to nest in them, being important for wildlife for at least the next 50-80 years.
      NIFF has asked for an explanation from Elin Heistad (manager for Sørum Fritidsgård) to why the trees have been removed, and underlined the importance for developing a management plan of the area where nature should have first priority.



10 August 2018

Bat Call Reference Library Collection Trip in Trøndelag
During the 10th European Bat detector Workshop in Biddarai (the Basque Country) in 2017, there was established a working group whose aim was to standardize methods for collecting bat calls in the field. Special focus was on (1) developing microphone standards, (2) establishing a bat call reference library and (3) enabling inexpensive high quality detectors and microphones.
      In connection to this work, five people joined a post-workshop expedition to Trøndelag (Central Norway) during
6. to 9. of August. Chris Corben (USA/Australia), Leif Gjerde and Arnold Andreasson participated as specialists from the working group, while Laura Alsina (Spain) and Angel Iglesias (Catalonia) also joined.
Three colonies were visited on three separate days to collect calls from emerging bats. Also the surrounding habitats were visited. The species were from known colonies of Myotis brandtii, Myotis mystacinus and Eptesicus nilssonii, making species identification safe for the calls collected. Furthermore, no nearby colonies exist of any confusing species.
      The results from the trip will be included in the Proceedings. More details will also be included in the next number of
Fennoscandian Bats. A photo gallery will eventually be available on www.batlife.info.




6 August 2018

3rd European Alpine Bat Detector Workshop organized in Askim, Norway
A handful of people from 9 countries participated during the 3rd European Alpine Bat Detector Workshop which was organized in Askim (South-Eastern Norway) during 2. - 6. August 2018. This series of workshops were first organized in Trenta (Slovenia) during 2012, followed by the second in Vercors (France) in 2015. So this years workshop was the beginning of a new tradition, with the third of its kind.
      The workshop was organized by Leif Gjerde and Arnold Andreasson, both from NIFF, who were responsible for the program. The aim of the workshop was to provide field training in practical bat work, especially with the use of various models of both passive and active bat detectors.
The results from the workshop will be included in the Proceedings. More details will also be included in the next number of Fennoscandian Bats. A photo gallery will eventually be available on www.batlife.info.



4 June 2018

Leira river plains surveyed for bats
The riverplains to the river Leira were surveyed during 24. May to 3 June. A total of 8 transects and 25.6 km were surveyed by foot. The same area was last surveyed 25 years ago. However, the Leira area is frequently visited during various excursions or specific projects every year, but this is the first time since 1993 that the entire area has been surveyed systematically. Most of the work was carried out this summer, but two transects still remain. So the work will be finished off next summer, when we hope to add some new transects in the north and east of the area.



2 May 2018

The Romsås-project presented at the Edinburgh-conference
The Second Social Calls of Bats Conference was organized during 26. and 27. April in Edinburgh, Scotland. Leif Gjerde from NIFF was invited, presenting the talk «Applying bird census techniques
to survey bat territories of Vespertilio murinus». The talk presented experiences from the Parti-colored Bat at Romsås, using techniques used by ornithologists since the mid 1900's.


Main page and menu are always updated. The list above only include the past three months and/or last 10 updates.

Our English web pages are constructed for people living outside the Nordic countries, and are thus not purely a translation of our Norwegian pages. Therefore, they may be different in both contents and layout. If a link is made to a Norwegian speaking web page, there is not necessarily an English alternative.

Our home pages are made despite the lack of support of the Norwegian Directorate for Nature Management.