World Bird List

Species factsheet

Voices can be found here (external link)

Subspecies and Distribution

-Subspecie
+Distribution
-atrifrons
+n Sulawesi
-surdus
+c Sulawesi
-subatrifrons
+Peleng and Banggai Is.  (off e Sulawesi)
-sulaensis
+Sula Is.  (e of Sulawesi)