Published in Bulletin of the British Ornithologists' Club, in 2015, in volume 135, issue 2, pages 190-192
Created: 2018-10-08, modified: 2018-10-08![](https://www.biodiversitylibrary.org/pagethumb/51286550,60,60)
Published in Journal of Raptor Research, in 1998, in volume 32, issue 3, pages 195-201
Created: 2017-04-07, modified: 2017-04-07![](https://www.biodiversitylibrary.org/pagethumb/47482042,60,60)
Published in Transactions of the Royal Society of South Africa, in 1913, in volume 3, issue 1, pages 249-254
Created: 2016-04-30, modified: 2016-04-30![](https://www.biodiversitylibrary.org/pagethumb/51327458,60,60)
Published in Journal of Raptor Research, in 2002, in volume 36, issue 4, pages 300-308
Created: 2017-04-07, modified: 2017-04-07![](https://www.biodiversitylibrary.org/pagethumb/47482016,60,60)
Published in Transactions of The Royal Society of South Africa, in 1913, in volume 3, pages 231-241
Created: 2017-10-11, modified: 2017-10-11