World Bird List

Species factsheet

Voices can be found here (external link)

Subspecies and Distribution

-Subspecie
+Distribution
-griseiceps
+Pegu Yoma Mts.  (sc Myanmar)
-robinsoni
+Tenasserim  (se Myanmar)
-henrici
+sw China, e Myanmar, n Thailand and n Indochina
-pallidus
+Hainan I.  (off se China)
-isani
+ne Thailand
-annamensis
+c Indochina
-khmerensis
+s Indochina