World Bird List

Species factsheet

Voices can be found here (external link)

Subspecies and Distribution

-Subspecie
+Distribution
-stellae
+sw China, s Myanmar and Indochina
-uniformis
+Malay Pen. and Sumatra
-oreskios
+Java
-dulitensis
+nw Borneo
-nias
+Nias I.  (off w Sumatra)