![Monogamy](https://i.ytimg.com/vi/uH_rIT0juiM/sddefault.jpg)
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monogamy human breeding strategy social monogamy mammal insects birds fish polygamy mate mating polygyny polyandry promiscuity sexual monogamy extra-pair copulation copulation breeding dunnock sparrow cuckold reproductive strategy reproduction territory swan biology zoology anthropology effective polygamy natural science scishow