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Which physical traits do primates share with other mammals?

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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).

Primates are members of the class Mammalia, and as such, they share several fundamental biological traits with other mammals. These defining characteristics include:

Nourishment: Primate young are nourished with milk produced by the mother's mammary glands.1
Physical Features: Like most mammals, primates possess hair and have a lower jaw hinged directly to the [skull].1
Internal Anatomy: They feature a diaphragm that separates the thoracic and abdominal cavities, a middle ear containing three tiny bones for sound transmission, and a circulatory system where only the left aortic arch persists.1
Cellular Biology: Mature red blood cells (erythrocytes) in primates, as in all mammals, lack a nucleus.1
Thermoregulation: Primates share the mammalian ability to regulate their internal body temperature, allowing them to adapt to diverse environments.1
Reproduction: Most primates are placental mammals, meaning they are viviparous and utilize a placenta to support fetal development.1