1. Environmental Optics Laboratory, Department of Biological Physics, Physical Institute, Eötvös University, H-1117 Budapest, Pázmány sétány 1, Hungary
2. Group for Methodology in Biology Teaching, Biological Institute, Eötvös University, H-1117 Budapest, Pázmány sétány 1, Hungary
3. Danube Research Institute, H-2131 Göd, Jávorka utca 14, Hungary
4. Department of Parasitology and Zoology, Faculty of Veterinary Science, Szent István University, H-1078 Budapest, István utca 2, Hungary
5. Department of Biology, Centre for Animal Movement Research, Lund University, Ecology Building, SE-223 62 Lund, Sweden