Both mandibles greatly compressed, the lower much longer than the upper, both convex on the sides towards the base; in the nestling when first hatched the bill is like that of a young Tern.
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.
Title in Book: