
Photo: Prashanth N S · CC BY 4.0 (May be cropped or resized)
Nisaetus cirrhatus
Habitat
Forest
Range
Garhwal Himalaya to Assam, southern Nepal and Bhutan, Sri Lanka and Southeast Asia
Size
Crest 10–14cm in the crested form
The changeable hawk-eagle is a forest eagle whose distribution includes the Garhwal Himalaya to Assam, southern Nepal and Bhutan, Sri Lanka, and east through Myanmar, Thailand, Peninsular Malaysia, western Laos, southern Vietnam and Cambodia (Wikipedia, general species account).
The crest tends to be longest in the form found in the Indian region, commonly 10 to 14cm, which is why that race is called the crested hawk-eagle. Wing chord ranges from 405 to 442mm in males and 448 to 462mm in females. The sources read give no diet, habitat or breeding detail, so none is stated.