Sterna dougalli Montagu, Orn. Diet. Suppl., 1813.
Our Indian bird may be distinguished from this, the typical form, by its slender bill and slightly darker plumage.
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.6 1929.
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