Yellow-bearded Greenbul (Criniger olivaceus) [XC301501]
by David Gibson from New Eddubiase Forest South entrance, Ghana (song)
Yellow-bearded Greenbul (Criniger olivaceus) [XC169709]
by \u00c9tienne Leroy from Asemkrom, Aowin\/Suaman, Western, Ghana (song)
Subspecies
No subspecies.
Yellow-bearded Bulbul (Criniger olivaceus) and White-bearded Bulbul (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 Bulbul (Criniger olivaceus).
Considered by some authors to form a superspecies with White-bearded Bulbul (Criniger ndussumensis) and others them as conspecific, on basis of vocal and behavioural similarities (responds to playback of song of that species). Considerable differences in coloration suggest that, although unquestionably closely related, the two are better treated as distinct species. This supported by results of recent molecular studies, which even suggest that present species is sister-taxon of Red-tailed Bulbul (Criniger calurus), rather than of White-bearded Bulbul (Criniger ndussumensis).
Similar Species
Western Bearded Greenbul (Criniger barbatus) which is smaller and has green, not greyish-brown, underparts, and less puffy throat.
References
See References.