1. R. Bischof ✉ (richard.bischof@nmbu.no), P. Dupont and C. Milleret, Faculty of Environmental Sciences and Natural Resource Management, Norwegian Univ. of Life Sciences, NO-1432 Aas, Norway.
2. J. Chipperfield, Norwegian Inst. for Nature, Res., Bergen, Norway. – J. A. Royle, USGS Patuxent Wildlife Research Center, Laurel, MD, USA.