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| Celebes mountain whistler (Pachycephala sulfuriventer); yellow-bellied whistler (Pachycephala sulfuriventer); yellow-vented whistler (Pachycephala sulfuriventer) | |||
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| Celebes mountain whistler (Pachycephala sulfuriventer); yellow-bellied whistler (Pachycephala sulfuriventer); yellow-vented whistler (Pachycephala sulfuriventer) | |||