Pachycephala

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".

Species in taxonomic sequence
There are nearly 3 dozen species:
 * Olive Whistler, Pachycephala olivacea
 * Red-lored Whistler, Pachycephala rufogularis
 * Gilbert's Whistler, Pachycephala inornata
 * Mangrove Whistler, Pachycephala cinerea
 * Green-backed Whistler, Pachycephala albiventris
 * White-vented Whistler, Pachycephala homeyeri
 * Island Whistler, Pachycephala phaionotus
 * Rusty Whistler, Pachycephala hyperythra
 * Brown-backed Whistler, Pachycephala modesta
 * Sulphur-vented Whistler, Pachycephala sulfuriventer
 * Bornean Whistler, Pachycephala hypoxantha
 * Vogelkop Whistler, Pachycephala meyeri
 * Grey Whistler, Pachycephala simplex
 * Fawn-breasted Whistler, Pachycephala orpheus
 * Sclater's Whistler, Pachycephala soror
 * Rusty-breasted Whistler, Pachycephala fulvotincta
 * Yellow-throated Whistler, Pachycephala macrorhyncha
 * Black-chinned Whistler, Pachycephala (pectoralis) mentalis
 * Yellow-bellied Whistler, Pachycephala philippinensis
 * Australian Golden Whistler, Pachycephala pectoralis
 * Lord Howe Golden Whistler, Pachycephala pectoralis contempta
 * Norfolk Golden Whistler, Pachycephala pectoralis xanthoprocta
 * Balim Whistler, Pachycephala pectoralis balim
 * Bismarck Whistler, Pachycephala citreogaster
 * Oriole Whistler, Pachycephala orioloides
 * Melanesian Whistler, Pachycephala caledonica
 * White-throated Whistler, Pachycephala vitiensis
 * Fiji Whistler, Pachycephala graeffi
 * Tongan Whistler, Pachycephala jacquinoti
 * Mangrove Golden Whistler, Pachycephala melanura
 * Samoan Whistler, Pachycephala flavifrons
 * Hooded Whistler, Pachycephala implicata
 * Bare-throated Whistler, Pachycephala nudigula
 * Lorentz's Whistler, Pachycephala lorentzi
 * Regent Whistler, Pachycephala schlegelii
 * Golden-backed Whistler, Pachycephala aurea
 * Rufous Whistler, Pachycephala rufiventris
 * Black-headed Whistler, Pachycephala monacha
 * White-bellied Whistler, Pachycephala leucogastra
 * Wallacean Whistler, Pachycephala arctitorquis
 * Drab Whistler, Pachycephala griseonota
 * Cinnamon-breasted Whistler, Pachycephala johni
 * White-breasted Whistler, Pachycephala lanioides

An unidentified Pachycephala whistler was heard on May 14, 1994 at 1,000 meters ASL south of the summit of Camiguin in the Philippines, where the genus was not previously known to occur. It might have been an undescribed taxon, or simply a vagrant of a known species.