3rd European Alpine Bat Detector Workshop

2 - 6 August 2018
Askim, Norway

Accommodation Objectives Registration Oslo Area Bat Fauna
Program Travel
Post-Workshop Expedition  Proceedings

The European Alpine Bat Detector Workshop was first organized in Trenta (Slovenia) during 2012, followed by the second in Vercors (France) in 2015. Thus, this years workshop is the beginning of a new tradition, with the third of its kind.
      Nordic Chiroptera Information Center (NIFF)  organized the 3rd European Alpine Bat Detector Workshop, which was held in Askim (South-Eastern Norway), only 55 km from downtown Oslo and 37 km from the Swedish border.
      The aim of the workshop was to get field training in practical bat work, especially the use of various models of both passive and active bat detectors. Organizers were Leif Gjerde and Arnold Andreasson.

Successful workshop finished
We thank everyone who participated in Askim, and the people who participated in the bat call reference library collection trip afterwards.
      The results from the workshop will eventually be available electronically (pictures, presentations and bat call recordings), while the Proceedings will include the articles describing the talks, activities and results from the workshop.
      I am sure everyone will enjoy their knowledge and experience from the workshop, and the stay became a platform for future work and cooperation.
      Hope you will join us at the 4th European Alpine Bat Detector Workshop in September 2021.


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The photo gallery will be available soon.

The participants.

The information below was pre-workshop information. This web page will not be updated anymore.

Lectures & Workshops

The main activity will be located at Askim Speiderhus (Scout House) near the centre of Askim . The address is Tornerudveien 32. Lectures, workshops, brakes and lunches (snacks) will be located here. So this will be our location all day. This will also be the starting and ending point for the evening trips as well.

  • Lecture/dining room for 45 people
  • Living room with fire place (20 people)
  • 4 seminar rooms (5-8 people each)
  • Good internet connections included
  • Fully equipped kitchen with large refrigerated volume

Web-page only available in Norwegian.


The Scout House in Askim.


Accommodations & Food

It is possible to find your own accommodation. However, our offers below are very reasonable.

Smaalenenes Hotel
Lies near the centre of Askim (Address: Vammaveien 25) just 1.5 km from the Scout House. This will be the main accommodation and we have got Youth Hostel prices for shared rooms. They have 6 rooms with 3 or more beds. Same sex rooms. They have 31 rooms in all, and offer also double or single rooms. Breakfast is included. They have free parking and internet.

  1. Shared room (3 people or more same sex). NOK 375,-/person pr. night
  2. Double room (2 people). NOK 575,-/person pr. night.
  3. Single room. NOK 950,-/night

Breakfast included. No sheets or sleeping bags necessary.

Olberg Camping
Located 20.7 km from the Scout house and takes 25 minutes to drive. Address: Sandsveien 4, Trøgstad. We have reserved cabins with cooking possibilities. This is good for families, pairs or groups who wish to spend some time together. Nice surrounding, and known for high densities of moose. They also offer moose safaris with money back guarantee!
      This is the cheapest solution if you share a cabin. But breakfast is not included. Refrigerator and cooking possibilities in each cabin. Toilet and showers typical for camping site (separate building).

They have 5 cabins for rent. Two cabins with 4 beds (NOK 510,-/cabin), two cabins with 5 beds (NOK 615,-/cabin) and one cabin with 6 beds  (NOK 670,-/cabin).

They also offer moose safari with money back guarantee!

Breakfast included in Smaalenenes Hotel. Not included at camping site.
Lunch, simple snack (fruit, cookies etc.) at the scout house. (Included in registration fee)
Dinner (warm meal) at hotel for all (including non-residents). Price: NOK 600,- for 4 days.

NB! Do not book directly from hotel/camping above. All bookings should be made directly to workshop organizers upon registration of participation. E-mail: niff@flaggermus.no.




The Scout House in Askim.


Olsberg Camping.


The objective of the workshop is to improve 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.
      The target group is idealistic bat workers (enthusiasts/idealists, NGO's and scientists) who is or will work with bats in the future. Students and NGO's may apply for reduced fee. Commercial bat workers will be excepted if there is space.

  • Learn the basic theory of bat identification with the aid of ultrasound devices.
  • Field training in using active detectors, such as the Petersson (D240X, D980), the AnaBat Walkabout, the EchoMeter and misc. flat screen versions.
  • Learning how to operate the passive detectors produced by Pettersson (D500x), Titley (AnaBat Express and AnaBat Swift), Mini Batcorder (EcoObs) and Wildlife Acoustics (SongMeter 2, 3 and 4).
  • Analyzing bat calls by using software from Pettersson (BatSound), Titley (AnaLook), Biotope (SonoChiro 4) and Wildlife Acoustics (Kaleidoscope).

The results from our surveys will be published in the proceedings for the workshop, alternatively in a European periodical.

Equipment in which we will have available for testing are:

Passive detectors

  • AnaBat Express (Titley Scientific)
  • AnaBat Swift (Titley Scientific)
  • D500x (Pettersson Elektronik)
  • SongMeter 2 (Wildlife Acoustics)
  • SongMeter 3 (Wildlife Acoustics)

Active detectors

  • Pettersson (D100, D980)
  • Titley Scientific (Walkabout)
  • Wildlife Acoustics (EchoMeter)


  • BatSound 4.2
  • AnaLook
  • SonoChiro 4
  • Kaleidoscope Viewer

If you have suggestion to other equipment you would like to test, please let us know. We might be able to make this possible.


Searching for emerging bats at Vercors
during the 2nd EABDW.

Analysing bat sounds in Trenta during
the 1st EABDW.

Chris Corben demonstrationg a car mounted microphone in Lithuania during the 8th EBDW.



The workshop is carried out on a low budget principal, meaning everything is based on self cost.

For every participant we need to know when you expect to arrive, and if you are travelling by car. It may be possible to pick up participants in Oslo, Lillestrøm or Gardermoen. We need to be notified of this as early as possible.

Please contact Leif Gjerde on e-mail niff@flaggermus.no, and notify us...

  1. time of arrival
  2. accommodation preferences
  3. dinner at hotel (NOK 150/meal)
  4. diet requirements (diabetes, vegetarian, allergies etc.)
  5. travel by own car, or wish to be picked up (if possible)
  6. what detectors you will bring (if you have any)
  7. title and abstract of talk (if you expect to have one)

There is an upper capacity of the scout house at 45 people. We have so far (31 July 2018) received applications from 16 people (from 8 countries) who all have been accepted.

A typical package (shared hotel room with breakfast, dinner, normal participant fee) costs 3,000 NOK (≈ 300 euros). Transportation to/from Askim is not included. Make sure you have confirmation of participation before you pay!

International payments (including all euro countries): IBAN no.: NO72 1271 2190 378, and SWIFT: AUSNNO21 for international payments to the NIFF account.

IMPORTANT! Your payment should be the sum of the following:

  • accommodation
  • dinner (optional, but recommended)
  • registration fee (se right frame)




Deadline registration:

Deadline manuscript
31st December 2018


IBAN number:
NO72 1271 2190 378


NIFF, Postboks 247, N-2001 Lillestrøm

1 euro ≈ 10 NOK

Includes rent of workshop location, lunch, excursions (road tax, gas) and papers.

  • Normal ― NOK 900
  • Students* ― NOK 200
  • Consultants ― NOK 1,500

*This applies only for students who pay from their own pocket. If the trip is covered from their university or through a scholarship, they pay normal price!

Participating sponsors who provide equipment for testing pay normal fee.

The Oslo region

This includes, in addition to Oslo itself, the region east of Oslo (Romerike), southeast (Follo) and the Askim area (Indre Østfold). Romerike include the the localities Leira, Øyeren and Østensjøvannet. Oslo include the river Akerselva and lake Sognsvann.
There are bat groups in Oslo, Romerike and Østfold which have been active in various degree since the mid 1990's. They have their own web pages.

Description of landscape and surroundings will follow...

Some links:

NB! Some links are in Norwegian. I will later try and make direct links to Google Translator.



Romsåsen mines.

The Bat Fauna

The bat fauna of the Oslo area will gradually be presented here.

Vespertilio murinus
A common bat which usually is found during fall display flight around tall apartment buildings in the cities.

Eptesicus nilssonii
The most common bat. Cosmopolitan (all habitats). Locally in large numbers.


Bat species found in the Oslo country:
  1. Nyctalus noctula
  2. Nyctalus leislerii
  3. Vespertilio murinus
  4. Myotis daubentonii
  5. Myotis mystacinus
  6. Myotis brandtii
  7. Myotis nattereri
  8. Pipistrellus pipistrellus
  9. Pipistrellus pygmaeus
  10. Pipistrellus nathusii
  11. Plecotus auritus
  12. Barbastella barbastellus

Temporary program

Start: The workshop building will be accessible from 1500 h on the 2nd of August, and the program starts at 1800 h.

End: The workshop will end on the 6th of August at 1000 h.

We will have at our disposal active and passive ultrasound detectors from three different producers (Titley Scientific, Petterson Electronic and Wildlife Acoustics). This will give the participants possibility to get familiar with different type of work equipment and possibilities that they offer.
      During the day we will analyze the recordings from previous evenings and attendants will be invited to have 20 minute lectures.
      In the evening we will divide in groups who will check different locations for bats. Each group will have at least one experienced bat worker, who will lead them and be responsible for the quality of the collected data.


  1. The Bat Fauna of South-eastern Norway – by Leif Gjerde
  2. Landscape, climate and vegetation of South-eastern Norway – by Leif Gjerde
  3. Three inexpensive bat detectors; 5€ - 50€ - 500€ – by Arnold Andreasson
  4. Automatic extraction and visualisation of metrics from sound files – by Arnold Andreasson
  5. How objective is subjective data collecting? Experiences and challenges from the Danish NOVANA project on bats in 2014 – by Leif Gjerde
  6. Is a "one night stand" sufficient for monitoring bat populations? A case study from Bornholm (Danish NOVANA project) in 2015 – by Leif Gjerde
  7. Acoustics for Bat Identification – Integrating Zero-Crossings with Full-Spectrum – by Chris Corben
  8. Microphone Basics and Best Usage (Include demonstration of AnalookW) – by Chris Corben
  9. Bat Social Calls – Why bother? Building a Case for more Research  (temporary title) – by Neil Middleton
  10. Using ultrasound devices for 3D tradjectory to monitor bat flight and behaviour. New advances and challenges. (temporary title) – by Didier Mauuary


  1. Assembling your own detector and pulse generator – organized by Arnold Andreasson
  2. How to assemble the Cloud Bat Detector – organized by Arnold Andreasson
  3. Round table discussion and workshop on microphones (testing and standards) – organized by Didier Mauuary
  4. Requirements for building a reference library – organized by Chris Corben, Leif Gjerde, Arnold Andreasson and Didier Mauuary
  5. Bat Social Calls: How could we miss them, and how do we include them? – organized by Neil Middleton

Field trips (night)
Localities described in links above.

  1. Øyeren. Shoreline with highest density of foraging V. murinus in Norway. Meander river of Leira (Lillestrøm).
  2. Østensjøvannet. Euthrophic lake with high densities of foraging bats (400-600 individuals of E. nilssonii along 4 km shoreline).
  3. Agricultural College of Ås (NLH). Park and buildings from the 1800's. The park is in a mixed English and French style, with many old trees and ponds.
  4. Not decided (maybe locally first night)

Field trips (day)

  1. Township of Romsås (Oslo) to see fall habitat of display flying Vespertilio murinus
  2. Romsåsen mines (Askim). Highest bat species diversity in Norway. Mine monitored for years, and include a visiting centre.
  3. Colony of E. nilssonii (one group might start evening here)



Chris Corben talking about zero-crossing and the AnaBat system.

Leif Gjerde deploying a AnaBat SD2 passive detector.

Lea Likozar talking having a talk during
the 1st EABDW.

Travel instructions

The 3rd EABDW will take place in Askim (in Østfold), a small village located 55 km from downtown Oslo.

The workshop will take place in the village of Askim at 59.585985 N 11.146326 W. It is a 10 minute walk from the train station in Askim to the the scout house.

Some distances and travel times:

Stretch km Time (h.minutes)
Gardermoen (Jessheim) - Askim 99 1.37
Torp (Sandefjord) - Askim 172 2.14
Göteborg - Askim 241 2.49

The nearest airports from Askim are:
1. Gardermoen - OSL (Oslo) - 99 km (1h 37min)
2. Torp - TRF (Sandefjord) - 172 km (2h 14min)
3. Landvetter GOT (Sweden) - 241 km (2h 49min)

Airplane companies leaving from Torp (Sandefjord Airport) are a.o. Norwegian Air Shuttle, Ryan Air (Irish), KLM (Dutch), Wizz Air (Hungarian).

The travel costs from Stansted (London) at 0940 h to Gardermoen on 2nd of August, and return (arrival Stansted at 1630 h) are 98 pounds (checked 6th Jan.).

Train from Gardermoen airport
NSB is the main company. From Gardermoen airport there is also "Flytoget" or the airport plane. They are both state owned, but the airport plane is a lot more expensive. Tickets for these are bought at separate machines and at separate ticket counters, but just few meters apart. So this can be confusing.

NB! The airports name is Gardermoen, but officially it is "Oslo Lufthavn". So searching databases you might need to use the official name. On train platform Gardermoen might be used.

Train from Gardermoen airport to Oslo S (Oslo Sentralbanestasjon). At Oslo S you need to change train for Askim.

All train, bus, tram, boat routes are available on: www.trafikanten.no or https://ruter.no/en/



Sampling bat calls in Trenta during the
1st EABDW.

Likozar demonstrating how to use the
EchoMeter in 1-2-3 during the 1st EABDW
in Slovenia.

Bat Call Reference Library Collection Trip
6th - 9th August 2018

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, the group will have a post-workshop expedition to Trøndelag (Central Norway). Three colonies will be visited on three separate days to collect calls from bats emerging the colonies, and from the surrounding habitats.

The species are 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.




There will be a DVD publication after the workshop which include pictures, sound files, analysis and statistics.

In addition we hope to publishing the results of our bat detector workshop in a special issue of Gudnjoloddi (ISSN 0809-2362). It will be published by NIFF and Bluebat together. The title will be "Proceedings from the 3rd European Bat Detector Workshop, held in Askim (Oslo) during 2nd to 6th of August 2018". Leif Gjerde will be editors of the proceedings. It is expected that each lecture will be published as a separate article in the proceedings. If no manuscript is received, we will publish the abstract alone.
      There is no limitation for the length of the articles, but the contents should be relevant to the talk. The proceedings will be in English entirely. There will not be included abstracts in Norwegian.

Deadline for contributing article manuscript is 31 December 2018.

Structure of reference for the proceedings
Gjerde, Leif. 2019.
The Bat Fauna of South-eastern Norway. Gudnjoloddi (Lillestrøm) ?: ?-?. ISSN 0809-2362.
Gjerde, Leif. 2019.
The Bat Fauna of South-eastern Norway. Pp. ?-?, in Proceedings from the 3rd European Alpine Bat Detector Workshop, held in Askim (Norway) during 2nd to 6th of August 2018 (Leif Gjerde, eds.). Nordic Chiroptera Information Center, Lillestrøm 2019. ? pp. ISBN 978-82-7905-???-?.


Sponsors providing field equipment:


Page established 6 January 2018
Last updated 12 August 2018

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