[18] Espinas, p. 417.
[19] The ostrich forms, however, a curious exception. The male sits on the eggs, and brings up the young birds, the female never troubling herself about either of these duties (Brehm, ‘Bird-Life,’ p. 324).
[20] Ibid., p. 285. These statements concerning birds are taken from Brehm’s ‘Thierleben,’ vol. iv., the same author’s ‘Bird-Life,’ and Hermann Müller’s ‘Am Neste.'
[21] Brehm, ‘Thierleben,’ vol. iii. p. 679.
[22] Ibid., vol. iii. pp. 593, 594, 599.
[23] Ibid., vol. iii. p. 578.
[24] Rengger,‘Naturgeschichte der Säugethiere von Paraguay,’ p. 354.
[25] Brehm, vol. iii. p. 206.
[26] Ibid., vol. iii. p. 256. Espinas, p. 447.
[27] Brehm, vol. iii. p. 124.