On this page we present all our scientific publications and activities on conferences.


Together with colleagues from the USA, South Africa, the Czech Republic, Belgium, Great Britain and Canada we looked at 15 different roadkill projects and compared them with each other.

The idea behind it was not of a purely academic nature, but was very practical. We wanted to find out how the different projects work, who can take part, what data is collected and what consequences result from it. Based on the results, we would like to try whether it would be possible to link all these projects together to create a global roadkill reporting system. Such an approach would make it possible to show even more clearly the impact of road traffic on biodiversity.

If you would like to know more about the recommendations that have been developed for similar projects and how the projects developed for public authorities or for road maintenance companies differ, you are welcome to read the original article that we have linked at the end of the blog.


Globally, wildlife-vehicle conflict (WVC) fragments wildlife populations (due to road/traffic-aversion), kills and injures individual animals, can cause wildlife population declines, may eventually contribute to local or total extinction of certain species, and can harm vehicles and drivers. Preventing WVC begins with recording locations of conflict, such as vehicle crashes, animal carcasses (roadkill), or animal behavior around roads, such as avoidance of roads or crossing-behavior. These data are ideally used to inform transportation policy and planning and to retrofit roadways and their structures to reduce WVC. We are collectively involved with or manage eight regional or national systems for reporting WVC in collaboration with volunteers and/or agency staff. In this review, we survey systems for recording WVC by volunteers and agency staff at different geographical scales, based on existing literature and our personal experience. We report the range of data collection methods, data management systems and data visualizations employed as well as discuss the groups and type of volunteers and agencies involved. We use our expertise and the global survey to provide methodological specifications based on current best-practice for collecting and using WVC data to inform transportation and conservation decisions. We conclude with a vision of next steps toward a global network of WVC reporting systems, that have clear and practical applications for improved conservation research as well as guidelines for management of road networks.

Unfortunately we could not afford to pay the $3000 for a free-access publication, but we got permission from the publisher to publish a so-called "pre-print" version of the article. This means that under the following link you can read a version of the article, which still contains a few small typos, but otherwise has the same content as the original article:

If you have any questions regarding this article, please feel free to post them in our blog post on Österreich forscht in the comments.


Recently a new peer-review article on our project was published. Together with colleagues from Belgium, the Czech Republic and the UK, an article was written about the benefits and challenges of working with volunteers in roadkill projects. In 4 projects we worked with very different groups. The complete article is of course freely available at:

The abstract:

Daily, a large number of animals are killed on European roads due to collisions with vehicles. A high proportion of these events, however, are not documented, as those obliged to collect such data, only record a small proportion; the police only register collisions that lead to traffic accidents, and hunters only collect data on game wildlife. Such reports disproportionately under-records small vertebrates such as birds, small mammals, amphibians and reptiles. In the last decade, however, national wildlife roadkill reporting systems have been launched, largely working with citizen scientists to collect roadkill data on a national basis that could fill this data gap. The aim of this study is, therefore, to describe for the first time, existing projects in Europe, and the user groups that submit data to them. To give a deeper understanding of such projects, we describe exemplar scientific roadkill reporting systems that currently exist in Austria, Belgium, Czechia and the United Kingdom. We define groups of people who contribute to such citizen science activities, and report our experience and best practice with these volunteers. We conclude that volunteers contribute significantly to collecting data on species that are not typically recorded in official databases. To ensure citizen-science projects perpetuate, (I) volunteers need to be motivated by the organisers to participate on a long-term basis, (II) volunteers need support in identifying roadkill species where required, and (III) regular feedback is required on how their contribution is used to produce new scientific knowledge.

From 26th to 28th June 2019 we were with our project at the 5th Austrian Citizen Science Conference in Obergurgl/Tyrol. A great event of the Citizen Science Network Austria. The organizing committee consisted of representatives of the University of Innsbruck, the University of Natural Resources and Applied Life Sciences Vienna, the Center for Citizen Science at OEAD, Schweiz forscht (CH), Bürger schaffen Wissen (D) and Partizipative Wissenschaftsakademie at the University of Zurich and ETH Zurich. The participants and the scientific contributions were therefore correspondingly diverse. Representatives from universities, universities of applied sciences, associations, museums, funding organisations and many more came to exchange ideas across disciplines.

We were at the event with a poster on data quality and gave an insight into Irene Hoppe's master thesis (in German):


Poster Roadkill Igel

On April 5th we had the opportunity to present a poster at the Austrian Academy of Sciences showing how our project can contribute to the UN Sustainable Development Goals. The Austrian Academy of Sciences organised the international symposium "Global Sustainable Development Goals in a Mediatized World" on 4 and 5 April 2019. Achieving the goals laid out in the Agenda 2030 in a mediatized world poses new challenges and opportunities for all stakeholders, including the scientific community. 

You can see the presented poster here:


Poster Roadkill

At the beginning of February we were invited to the Austrian Citizen Science Conference 2018 in Salzburg to present our experiences with Citizen Science in a peer-review process. Specifically, it was to show how we, from the project Roadkill, have experienced the process of publishing in peer-reviewed journals.

A short summary of the whole really exciting event can be found on Österreich forscht.

In addition, on the third day of the conference, the so-called Aktionstag, we were able to present the Roadkill project to a very interested Salzburg audience at a market stand and show in practice how citizens can help in our project.

For all interested in our experiences, you can see the poster presented here:

20180120 Poster Roadkill1 

We published our third paper in the project in the Journal BMC Ecology yesterday (27 June 2017). The article is open access available, please visit the article webpage to read the fulltext:

We would also be happy if you read and share our blog:

To get an impression, here is our abstract:


Amphibians and reptiles are among the most endangered vertebrate species worldwide. However, little is known how they are affected by road-kills on tertiary roads and whether the surrounding landscape structure can explain road-kill patterns. The aim of our study was to examine the applicability of open-access remote sensing data for a large-scale citizen science approach to describe spatial patterns of road-killed amphibians and reptiles on tertiary roads. Using a citizen science app we monitored road-kills of amphibians and reptiles along 97.5 km of tertiary roads covering agricultural, municipal and interurban roads as well as cycling paths in eastern Austria over two seasons. Surrounding landscape was assessed using open access land cover classes for the region (Coordination of Information on the Environment, CORINE). Hotspot analysis was performed using kernel density estimation (KDE+). Relations between land cover classes and amphibian and reptile road-kills were analysed with conditional probabilities and general linear models (GLM). We also estimated the potential cost-efficiency of a large scale citizen science monitoring project.


We recorded 180 amphibian and 72 reptile road-kills comprising eight species mainly occurring on agricultural roads. KDE+ analyses revealed a significant clustering of road-killed amphibians and reptiles, which is an important information for authorities aiming to mitigate road-kills. Overall, hotspots of amphibian and reptile road-kills were next to the land cover classes arable land, suburban areas and vineyards. Conditional probabilities and GLMs identified road-kills especially next to preferred habitats of green toad, common toad and grass snake, the most often found road-killed species. A citizen science approach appeared to be more cost-efficient than monitoring by professional researchers only when more than 400 km of road are monitored.


Our findings showed that freely available remote sensing data in combination with a citizen science approach would be a cost-efficient method aiming to identify and monitor road-kill hotspots of amphibians and reptiles on a larger scale.

The 10th Annual Meeting of the Macroecology Working Group for the Ecological Society Germany, Austria & Switzerland was held from 19-21 April 2017. This year, the titel of the conference was "Macroecology in Space and Time". Colleagues from the University of Vienna organised the conference with a broad focus on conservation biology, evolution and global change. We took the opportunity of living at the conference venue and presented a poster on our project and some new results.

20170410 Poster Roadkill

Today (10th October 2016) we published a new paper in Remote Sensing with the title "Comparing Road-Kill Datasets from Hunters and Citizen Scientists in a Landscape Context".

It is open access and therefore free for everyone to read:

We really wish to thank all citizen scientists in Project Roadkill for investing time and reporting data.

feldhase2 schindler

Here is the abstract of our published paper:

Comparing Road-Kill Datasets from Hunters and Citizen Scientists in a Landscape Context

Authors: Florian Heigl 1,*, Carina R. Stretz 1, Wolfgang Steiner 2, Franz Suppan 3, Thomas Bauer 3, Gregor Laaha 4 and Johann G. Zaller 1

1Institute of Zoology, University of Natural Resources and Life Sciences Vienna
2Institute of Wildlife Biology and Game Management, University of Natural Resources and Life Sciences Vienna
3Institute of Surveying, Remote Sensing and Land Information, University of Natural Resources and Life Sciences Vienna
4Institute of Applied Statistics and Computing, University of Natural Resources and Life Sciences Vienna

Road traffic has severe effects on animals, especially when road-kills are involved. In many countries, official road-kill data are provided by hunters or police; there are also road-kill observations reported by citizen scientists. The aim of the current study was to test whether road-kill reports by hunters stem from similar landscapes than those reported by citizen scientists. We analysed the surrounding landscapes of 712 road-kill reportings of European hares in the province of Lower Austria. Our data showed that road-killed hares reported both by hunters and citizens are predominantly surrounded by arable land. No difference of hedges and solitary trees could be found between the two datasets. However, significant differences in landcover classes and surrounding road networks indicate that hunters’ and citizen scientists’ data are different. Hunters reported hares from landscapes with significantly higher percentages of arable land, and greater lengths of secondary roads. In contrast, citizens reported hares from landscapes with significantly higher percentages of urban or industrial areas and greater lengths of motorways, primary roads, and residential roads. From this we argue that hunters tend to report data mainly from their hunting areas, whereas citizens report data during their daily routine on the way to/from work. We conclude that a citizen science approach is an important source for road-kill data when used in addition to official data with the aim of obtaining an overview of road-kill events on a landscape scale.

From 30 August to 2 September, the IENE (Infra Eco Network Europe) conference took place in Lyon (France). Florian Heigl presented the project Roadkill as Citizen Science Project and first results.

The IENE is a network of experts active in the field of ecology and linear transport infrastructure. This network is non-profit, non-governmental and non-political.

The title of this year's event was "Integrating transport infrastructure with living landscapes" to highlight how much infrastructure, from roads to airports to power lines, is part of the landscape. On the conference website you can get very detailed information about the conference, the presentations, posters and workshops. The conference was characterized by topics such as "What do functioning green bridges look like", "What new technical developments are there in the field of wildlife accident prevention", "What influence do roads have on biodiversity" and many more. The difference to many other conferences is that here scientists, officials from ministries, engineers and company employees meet to discuss and learn from each other.

The presented poster:

20160822 Poster Roadkill

Poster presentation “Data quality in citizen science projects considering roadkills” by Florian Heigl, Daniel Dörler and Johann Zaller; 1. European Citizen Science Conference in Berlin, Germany; 19. - 21. May 2016. More information regarding the conference:

The presented poster:

 Poster ECSA2016


Poster presentation “Citizen Science Project Roadkill – Connecting science, people and habitat fragmentation using European hare as a model organism” by Florian Heigl, Carina Stretz, Wolfgang Steiner,  Thomas Bauer, Franz Suppan und Johann Zaller; 45th Annual Meeting of the Ecological Society of Germany, Austria and Switzerland in Göttingen, Germany; 31. August - 04. September 2015.


 20150904 092806

Representatives of the Institute of Zoology at the GFÖ 2015.

The presented poster:



In recent years citizen science is getting more important in professional science. More and more professional scientists are integrating citizens in their research. However what is citizen science and where does it come from? Which impact does citizen science have on the cooperation of laypersons and professionals? How do citizen science projects work and are there examples in Austria? Can we do something to promote citizen science in Austria and make it easier for laypersons?

Florian Heigl and Daniel Dörler are answering these questions in German in the "Jahrbuch 2015 der Bildung für eine nachhaltige Entwicklung", which was published in June 2015.

More Information regarding the Jahrbuch:

15th April 2015, Carina Stretz, master student at the Institute of Zoology at the University of Natural Resources and Life Sciences, Vienna presented the poster Project Roadkill: Defining hotspots in European Hare vehicle collisions using datasets from citizen scientists and professionals at the European Geosciences Union
General Assembly 2015. More than 11000 scientists are attending the EGU GA to talk about latest trends and findings in a variety of scientific fields.

The presented poster:

 Poster EGU2015

We published our manuscript "Using a Citizen Science Approach in Higher Education: A Case Study Reporting Roadkills in Austria" von Florian Heigl und Johann Zaller; Fachzeitschrift Human Computation - Volume 1, Issue 2 (Citizen Science Special Issue); December 2014


Using a Citizen Science Approach in Higher Education: A Case Study Reporting Roadkills in Austria

FLORIAN HEIGL, Universität für Bodenkultur, Wien

JOHANN G. ZALLER, Universität für Bodenkultur, Wien

Citizen cyber-science as a crowdsourcing method is gaining popularity around the world especially in projects dealing with environmental issues. Many European universities are faced with increasing student numbers along with unchanged numbers of advising lecturers and professors. Thus, a challenge for natural science educators is to teach and transfer knowledge despite weak lecturer-to-student ratios. In search for a solution to this problem, we applied a citizen science crowdsourcing approach in an obligatory course of the Bachelor programme of Environment and Bio-Resources Management at the University of Natural Resources and Life Sciences Vienna, Austria. The project, called BOKUroadkill, engaged students in reporting roadkilled animals they observed during their daily routine over a period of three months. Data collection was carried out via a freely available, customized mobile app (EpiCollect) that ran on students’ private devices or via an additional online reporting form for students without smartphones or tablets. After three months, 109 students reported 1,236 animals killed on roads, analysed roadkill patterns, and provided feedback on the project. Based on this feedback, we developed a new online platform extending the project for all citizens to participate (www.citizen- Based on our experience with BOKUroadkill, we conclude that a citizen science approach in higher education is suitable for (1) courses with weak lecturer-to-student ratios, (2) addressing important elements of motivation for learners and (3) familiarizing students with scientific research. Our results indicate that citizen cyber-science projects can well be developed as student projects initially before extending the project to a broader public.


Heigl, F., & Zaller, J. G. (2014). Using a Citizen Science Approach in Higher Education: a Case Study reporting Roadkills in Austria. Human Computation, 1(2).

Get the free paper:[]=10



Poster presentation “Roadkill of European Hare in agricultural landscapes in Austria: citizen science vs. professional data.” via Florian Heigl, Wolfgang Steiner, Franz Suppan, Thomas Bauer and Johann Zaller; 44. Annual Meeting of the Ecological Society of Germany, Austria and Switzerland in Hildesheim, Germany; 8.-12. September 2014



GFOE2014Representatives of the Institute of Zoology at the GFÖ 2014

The presented poster:

Poster Hildesheim Roadkill1