When observing primates at the zoo, you notice a male and female gibbon quite similar in size, unlike what you previously saw in the hamadryas baboon enclosure.You know that

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Gibbons are known to have a monogamous social structure, where a pair of a male and a female retain a territory for themselves and their offspring. This reduces competition for mates, and as a result, sexual selection for more prominent secondary sexual characteristics, such as size, coloration, or weaponry, is weakened. Therefore, the lack of sexual dimorphism in gibbons is due to their monogamous social structure.

When Observing Primates at the Zoo, You Notice a Male