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
 * Bare-throated Whistler, Pachycephala nudigula
 * Fawn-breasted Whistler, Pachycephala orpheus
 * Regent Whistler, Pachycephala schlegelii
 * Melanesian Whistler, Pachycephala caledonica
 * White-throated Whistler, Pachycephala vitiensis
 * Fiji Whistler, Pachycephala graeffi
 * Tongan Whistler, Pachycephala jacquinoti
 * Samoan Whistler, Pachycephala flavifrons
 * Hooded Whistler, Pachycephala implicata
 * Vogelkop Whistler, Pachycephala meyeri
 * Sclater's Whistler, Pachycephala soror
 * Bismarck Whistler, Pachycephala citreogaster
 * Oriole Whistler, Pachycephala orioloides
 * Rusty-breasted Whistler, Pachycephala fulvotincta
 * Yellow-throated Whistler, Pachycephala macrorhyncha
 * Golden-backed Whistler, Pachycephala aurea
 * Black-chinned Whistler, Pachycephala 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
 * Mangrove Golden Whistler, Pachycephala melanura
 * Morningbird, Pachycephala tenebrosa
 * Brown-backed Whistler, Pachycephala modesta
 * Lorentz's Whistler, Pachycephala lorentzi
 * Yellow-bellied Whistler, Pachycephala philippinensis
 * Bornean Whistler, Pachycephala hypoxantha
 * Sulphur-vented Whistler, Pachycephala sulfuriventer
 * Mangrove Whistler, Pachycephala cinerea
 * Green-backed Whistler, Pachycephala albiventris
 * White-vented Whistler, Pachycephala homeyeri
 * Grey Whistler, Pachycephala simplex
 * Island Whistler, Pachycephala phaionotus
 * Rusty Whistler, Pachycephala hyperythra
 * Wallacean Whistler, Pachycephala arctitorquis
 * Drab Whistler, Pachycephala griseonota
 * Cinnamon-breasted Whistler, Pachycephala johni
 * White-bellied Whistler, Pachycephala leucogastra
 * Rufous Whistler, Pachycephala rufiventris
 * Black-headed Whistler, Pachycephala monacha
 * 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.