Mangrove whistler

The mangrove whistler ("Pachycephala cinerea") is a species of bird in the family Pachycephalidae found in South-east Asia.
Taxonomy and systematics.
Alternate 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.
Subspecies.
Two subspecies are recognized: