Amur falcons are the longest travelling raptors in the world. They weigh just 150 grams
Males are mostly grey in colour and the females have dark-streaked cream or orange underparts.
The species flies non-stop from Mongolia to northeast India covering 5,600 km in five days and nights, a small part of its 22,000 km circular migratory journey.
The birds halt briefly in Myanmar. After a month or so, they reach central and western India en route to South Africa.
Until recently, Naga tribesmen used to hunt thousands of Amur falcons for meat. But, after a vigorous campaign by wildlife activists, they have pledged to protect the bird and since then, not a single bird has been hunted in the area.
Wokha district of Nagaland is a declared second home of the Amur falcons.