Similar to Astur, except that there is a small crest formed by the nuchal feathers being somewhat lengthened, and the lower surface in adults is differently marked. There are two species, one of which is peculiar to Celebes, the other is Indian.
The Fauna Of British India including Ceylon and Burma
Blanford, William Thomas, ed. The Fauna of British India: Including Ceylon and Burma. Vol.3 1895.
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