A. P. Leventis Ornithological Research Institute, University of Jos, Jos, Plateau State, Nigeria;
Department of Watershed Sciences and the Ecology Center,Utah State University, Logan, UT 84322-5210, USA;
FitzPatrick Institute of African Ornithology, University of Cape Town, Rondebosch, Cape Town, South Africa;
A. P. Leventis Ornithological Research Institute, University of Jos, Jos, Plateau State, Nigeria;