World Bird List

Species factsheet
Grey-headed Swamphen (Porphyrio poliocephalus)

Order: Porphyrio poliocephalus
Family: Rails, Crakes & Coots (Rallidae)

Danske navn: Gråhovedet Sultanhøne

Voices can be found here (external link)
Subspecies and Distribution
Subspecie Distribution
seistanicus se Turkey to the Caspian Sea, nw Iran, Iraq to Pakistan and nw India
poliocephalus India and Sri Lanka to sw China and n Thailand, Andaman and Nicobar Is.
viridis s Myanmar to c and s Indochina to the Malay Pen.