Are Any Animals Truly Monogamous?

Monogamy is rare in the animal kingdom, with only 3% of mammals and 95% of birds practicing it. However, infidelity is common, as seen in superb fairy wrens, where only 25% of offspring are from the social father. This behavior is biologically advantageous, allowing genetic diversity and increased reproductive success. Dimorphism in animals often relates to mating strategies, with non-monogamous species showing pronounced differences. Humans exhibit physical differences, but it's unclear if they indicate a harem-like past or a monogamous yet adulterous society. Perfect fidelity is rare, exemplified by diplozoan paradoxim flatworms.

How does the mating behavior of male gorillas differ from that of male gibbons?

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What is unique about the mating behavior of diplozoan paradoxim flatworms?

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