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Rarity of monogamy.-Taste for change in animals.-R?les of monogamy and polygamy in the stability or instability of specific types.-Strife of the couple against polygamy.-Couples among insects.-Among fish, batrachians, saurians.-Monogamy of pigeons, of nightingales.-Monogamy in carnivora, in rodents.-Habits of the rabbit.-The ichneumon.-Unknown caus