White-bearded Greenbul © gbif.org

Yellow-bearded Greenbul (Criniger olivaceus) and White-bearded Greenbul (Criniger ndussumensis) (Sibley and Monroe 1990, 1993) are retained as separate species contra Dowsett and Forbes-Watson (1993) who include ndussumensis as a subspecies of Yellow-bearded Greenbul (Criniger olivaceus).

Sometimes treated, on basis of structural, behavioural and vocal similarities, as a subspecies of Yellow-bearded Greenbul (Criniger olivaceus) (which responds to playback of song of present species), but significant plumage differences suggest that, although clearly closely related, the two are better treated as distinct species. Alternatively, has often been considered conspecific with Red-tailed Greenbul (Criniger calurus) because of its close similarity in appearance to sympatric subspecies of Red-tailed Greenbul (Criniger calurus), but differs in both voice and morphology (suspected differences in foraging behaviour not proven, owing to difficulty of distinguishing between the two species in the field). Published reports of hybridization with Red-tailed Greenbul (Criniger calurus) (of subspecies emini) in north-eastern DRCongo seem to be based on observation of individuals apparently showing combination of characters then thought to be restricted to each form.


References
See References.


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