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In the Cape eland, also, the male is slightly darker than the female. Dr. Gray, 'Cat. of Mamm. in Brit. Mus. part iii. 1852, pp. 134-142; also Dr. Gray, 'Gleanings from the Menagerie of Knowsley, in which there is a splendid drawing of the Oreas derbianus: see the text on Tragelaphus. We meet in this species, as Mr.
Oranges, treatment of, by monkeys. Orange-tip butterfly. Orchestia Darwinii, dimorphism of males of. Orchestia Tucuratinga, limbs of. Ordeal, trial by. Oreas canna, colours of. Oreas Derbianus, colours of. Organs, prehensile; utilised for new purposes. Organic scale, von Baer's definition of progress in. Orioles, nidification of. Oriolus, species of, breeding in immature plumage.
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