Hitherto treated (in recent decades) as conspecific with G. religiosa (including G. robusta and G. indica), but differs in its dark green vs dark blue gloss (2); wattle extending in double line up central hindcrown (otherwise present only in G. indica but with different structure) (3); distinctive raised bilateral lumps on frontal part of crown (2); bill as large as in G. robusta (with which equal in size), although in other proportions closer to nominate G. religiosa (ns); and voice, reportedly involving several different calls#R (allow at least 1). Birds from Flores, described as race mertensi, have been considered inseparable from those in rest of range, but are fractionally larger than birds on Sumbawa to W and on Alor and Pantar to E. Monotypic.
Lesser Sundas from Lombok and Sumbawa E to Pantar and Alor.
Food and feeding
Status and conservation
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