WoRMS taxon details
basis of record
Urban, E. K.; Fry, C. H.; Keith, S. (1986). The Birds of Africa, Volume II. <em>Academic Press, London.</em> [details]
additional source
Neave, Sheffield Airey. (1939-1996). Nomenclator Zoologicus vol. 1-10 Online. <em>[Online Nomenclator Zoologicus at Checklistbank. Ubio link has gone].</em> , available online at https://www.checklistbank.org/dataset/126539/about [details]
From other sources
Description Size: large. Plumage: throat black or grey in male, white in female; tail long, stiff and graduated with 16-18 rectrices, outer one tiny; feathers on small carpal knob. Other characters: bill relatively large, tapered, not hooked; legs red or green; only female incubates. <389> [details]
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