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Why are humans classified as primates?

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Illustration comparing the body plans of representative anthropoids, showing a male western lowland gorilla, a male human, a male bonobo, a female Bornean orangutan, and male and female northern white-cheeked gibbons, all labeled and depicted to scale. — primate Representative apes (superfamily Hominoidea).

Humans are classified as primates because they share a common evolutionary descent with other members of this order, including monkeys and apes. Taxonomically, humans (Homo sapiens) are placed within the family Hominidae, which also includes the great apes, based on significant morphological and molecular evidence of their close relationship.12

The classification reflects deep biological connections. Humans share the fundamental anatomical and physiological traits characteristic of primates, such as a relatively large brain size, complex cerebral cortex, and specialized appendages for grasping. While humans have evolved unique adaptations like upright bipedalism, their skeletal and muscular systems conform to the basic structural plan inherited from their primate ancestors.435

Scientific consensus, established following the work of researchers like Carolus Linnaeus and Charles Darwin, recognizes that humans are not biologically separate from the primate order but are instead deeply integrated into its evolutionary history.1