Even among polygamous peoples monogamy prevails; because the one who is bound to several in marriage is most often devoted to one alone, and thus monogamy is in a sense more natural than polygamy. It is a tendency that is seen to a certain extent in birds and beasts. Doves, for instance, when mated remain attached to each other and share equally the responsibility of rearing their young. Many other animals always keep to one mate, and only after long separation, when they have lost consciousness of each other, will they accept a second mate. Such loyalty among animals is always a source of interest to man, and is in itself significant.