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Monogamy in animal behavior refers to the practice of having only one mate at a time. While common in humans, it is less frequent in the animal kingdom. This behavior is often driven by natural selection, favoring traits that enhance an individual's survival and reproductive success.123

Species exhibiting monogamy include:
* Beavers: Form lifelong pair bonds.2
* Gray wolves: The alpha male and female remain together for life.2
* Gibbons: Exhibit pair bonding, though they may occasionally have extra-pair relationships.2
* Macaroni penguins: Most pairs are monogamous, with males caring for chicks while females hunt.2
* Sandhill cranes: Known for their "unison calling" as a couple.2
* Bald eagles: Males assist in incubating eggs and feeding young.2

True genetic monogamy is rare, and even in socially monogamous species, females may engage in extra-pair copulations for various benefits. The mating system of a species is ultimately shaped by natural selection based on environmental factors like food availability and predation.45

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