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Photo: Mike Prince · CC BY 2.0 (May be cropped or resized)
Hierococcyx bocki
Range
Upper Malaya, northern Sarawak and Sabah; Sumatra and Kalimantan; Brunei
The dark hawk-cuckoo was formerly considered conspecific with the large hawk-cuckoo and placed in the genus Cuculus. In Malaysia it occurs in upper Malaya, northern Sarawak and Sabah; in Indonesia it is found on Sumatra and in Kalimantan, and it is also found in Brunei (Wikipedia, general species account).