Cf. Salvadori, Ornitologia Papuasia e Molucche, i. Torino, 1880, p. 125.
For this, as most Madagascar birds, see Grandidier, Histoire de Madagascar, and Sibree, Ibis, 1891, pp. 194-228, 416-443, 557-565; 1892, pp. 103-119, 261-274.
Cf. Salvin, P.Z.S. 1873, pp. 429-433.
Bronn's Thier-Reich, Aves, Syst. Theil, pp. 233-235. The Hoopoes used once be considered Passerine.
A. D. Bartlett, P.Z.S. 1869, p. 142; Flower, tom. cit. p. 150; Murie, op. cit. 1874, p. 420.