In this Subfamily the two species which it contains commence their moult of the tail with the fifth pair of tail-feathers. The males are distinguished by the immense length of their upper tail-coverts during the breeding-season.
The Fauna Of British India, Including Ceylon And Burma-birds(second Edition)
Baker, EC S (1922–1930) The fauna of British India, including Ceylon and Burma. Second edition. vol.5 1928.
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