These birds eject the lining of the gizzard in a most curious manner; cf. A. D. Bartlett, P.Z.S. 1881, pp. 247, 248.
H. O. Forbes. Naturalist's Wanderings, London, 1885, p. 32.
Birds of Europe, vi. 1879, pp. 193, 194.
Jerdon, Birds of India, ii. Calcutta, 1877, p. 860.
Ibid.