1. Dept of Ecology and Genetics; Univ. of Oulu; Finland
2. Open Science Centre, Univ. of Jyvaskyla; Finland
3. Dept of Biological and Environmental Sciences; Univ. of Jyvaskyla; Finland
4. FitzPatrick Inst. of African Ornithology, DST-NRF Centre of Excellence; Univ. of Cape Town; Rondebosch South Africa
5. Dept of Zoology, Inst. of Ecology and Earth Sciences; Univ. of Tartu; Tartu Estonia
6. Dept of Zoology and Animal Ecology; Univ. of Latvia; Rīga Latvia
7. Dept of Biological and Experimental Psychology, School of Biological and Chemical Sciences; Queen Mary Univ. of London; London UK