Pachycephala rufa; Print; Pachycephala is a genus of birds native to Oceania and Southeast Asia. They are commonly known as typical whistlers. Older guidebooks may refer to them as thickheads; a literal translation of the generic name; which is derived from the Ancient Greek terms pachys "thick" + kephale "head". This lineage originated in Australo-Papua and later colonized the Indonesian and Philippine archipelagos to the west and the Pacific archipelagos to the east.; 1868