Grey Nightjar (Caprimulgus jotaka) is present year-round in Northeast India and in parts of Southeast Asia, but is presumably a summer visitor to the Western Himalayas and East Asia.
Do the Northeast Indian populations migrate? Do the Western Himalayan populations go to Northeast India or Southeast Asia, or do they stay back and remain undetected? These are questions that are difficult to answer because the species is noctunal and usually calls only during summer.
Populations in East Asia however migrate down to Southeast Asia.