Mangrove whistlerThe mangrove whistler is a species of bird in the family Pachycephalidae found in South-east Asia.Taxonomy and systematicsAlternate names for the mangrove whistler include the grey thickhead and white-bellied whistler. The latter name should not be confused with the species of the same name, Pachycephala leucogastra. Formerly, both the green-backed and white-vented whistlers were considered to be subspecies of the mangrove whistler.SubspeciesTwo subspecies are recognized:P. c. cinerea – : Found from northeastern India to Indochina and the Greater SundasPalawan thickhead, or Palawan whistler – : Originally described as a separate species. Found in Palawan