1. Department of Wildlife Ecology and Conservation; School of Natural Resources and Environment; University of Florida; 110 Newins-Ziegler Hall Gainesville Florida 32611 USA
2. International Avian Research; Am Rosenhügel 59 3500 Krems Austria
3. Centre for Ecology and Hydrology; Benson Lane, Crowmarsh Gifford Wallingford OX10 8BB United Kingdom
4. Royal Society for the Protection of Birds, (RSPB) Scotland; Dumfries and Galloway Office; The Old School; Crossmichael Castle Douglas DG7 3AP United Kingdom
5. Scottish Raptor Study Group; 58 Meadowbank Road Kirknewton West Lothian EH27 8BS United Kingdom
6. Conansknowe; Kirkton Dumfries DG1 1SX United Kingdom