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Oriolus melanocephalus, coloration of the sexes in. Ornaments, prevalence of similar; of male birds; fondness of savages for. Ornamental characters, equal transmission of, to both sexes, in mammals; of monkeys. Ornithoptera croesus. Ornithorhynchus, reptilian tendency of; spur of the male. Orocetes erythrogastra, young of. Orrony, Grotto of. Orsodacna atra, difference of colour in the sexes of.
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