Large-Billed Crow

The large-billed crow is sometimes called the thick-billed crow and has a large bill which is the source of its name. There are ten subspecies and I believe I saw ssp. levaillanti which is found from northeastern India and eastern Nepal eastward to western Thailand and the Andaman Islands. This ssp. has also been sometimes treated as a separate species known as the eastern jungle crow. It has an arched culmen which is the dorsal ridge of the upper mandible. The base of the culmen is hidden by a layer of overlapping black rictal bristles. Its glossy black plumage has a purple sheen. I saw several of them in the Eastern Range of Kaziranga NP in Assam, India. I have a bad habit of only taking one or two photos of crows and ravens because they all look the same to me. Then I often find out it is a new species I haven't seen before and I regret not having taken more photos. This was one of those circumstances. 

Illustration of ssp. levaillanti from Birds of the World. 

Range from Birds of the World.