[1
]FitzPatrick Institute of African Ornithology DSI‐NRF Centre of Excellence Department
of Biological Science University of Cape Town Rondebosch South Africa
[2
]HawkWatch International Salt Lake City UT USA
[3
]The Endangered Wildlife Trust Johannesburg South Africa
[4
]Theoretical and Computational Ecology Institute for Biodiversity and Ecosystem Dynamics
University of Amsterdam The Netherlands