Authors: Andrew J Bladon | Till Töpfer | Nigel J Collar | Kai Gedeon | Paul F Donald | Yilma Dellelegn | Mengistu Wondafrash | Jarso Denge | Galgalo Dadacha | Motuma Adula | Rhys E Green

Published in Bulletin of The African Bird Club, in 2015, in volume 22, issue 2, pages 148-161

Created: 2021-03-24, modified: 2025-12-17

Authors: Peter V Fankboner

Published in Biol Bull, in 1971, in volume 140, pages 28-45

Created: 2010-01-06, modified: 2011-06-21