Black Baza (Aviceda leuphotes) breeds in parts of eastern Nepal, Northeast India, Southeast Asia and China. Populations that breed in the Eastern Himalayas presumably migrate down to the southern Western Ghats in winter. Birds from the eastern and northeastern parts of its range largely migrate south to Southeast Asia although some East Asian birds might also be visiting India.
During migration in India, small flocks of Black Baza are sometimes seen in central and South India on their way to the Western Ghats. But in Southeast Asia, spectacular flocks of tens of thousands of Black Bazas can be seen during autumn migration in parts of Thailand and thereabouts.