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The Evolution of Humans: Characteristics & Evolutionary History

  • 0:05 Characteristics of Primates
  • 0:50 Evolution of Primates
  • 1:42 Characteristics of Humans
  • 2:45 Evolution of Humans
  • 5:04 Lesson Summary
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Lesson Transcript
Instructor: Danielle Weber

Danielle teaches high school science and has an master's degree in science education.

Just like other organisms, humans have changed over time. We will look at the evolution of humans as well as connections with our primate relatives, including Old World and New World primates.

Characteristics of Primates

Examples of hominoids
Hominoid Examples

We humans are a very distinct group of animals. However, there are many characteristics that we share with our primate relatives. Primates are mammals with:

  • forward-looking eyes
  • hands and feet capable of grasping
  • large brains
  • complex social behaviors

The forward-looking eyes, rather than having eyes spaced out to have improved peripheral vision, allow for increased depth perception. The complex social behavior varies greatly within primates, but a common feature among all primates is good prenatal care and care for the young. Another similarity is having fingernails rather than claws such as those that other mammals, like cats and bears, have. All primates also have fingerprints due to small ridges on their fingers.

Evolution of Primates

The earliest primates lived in trees. They used their hands and feet - both capable of grasping - to move between and among trees using the branches and vines. Some also had tails to help maintain balance. A living organism that most closely resembles these early primates is the lemur. These early primates separated into two groups with distinctively different patterns of evolution. The Old World primates reside in Africa and Asia, while the New World primates reside in South America.

One difference between humans and other primates is that humans have smaller jawbones
Human Jaws

The hominoids, a group of primates including gibbons, orangutans, gorillas, chimpanzees, bonobos, and humans, began to evolve from an Old World ancestor about 20-25 million years ago. Unlike other primates, such as lemurs and spider monkeys, these hominoids have long arms but short legs and do not have tails.

Characteristics of Humans

We started by looking at characteristics of primates and a brief overview of their evolution, but let's now specifically look at the characteristics and then the evolution of humans. Humans are bipedal primates that are capable of language, symbolic thought, and both the creation and use of complex tools. 'Bipedal' means 'walking on two feet.' Most of our primate relatives are quadrupeds, meaning they walk on four feet. Humans stand upright and walk on just two feet.

Humans also have proportionally larger brains than other primates. This increased brain size allows for complex language, symbolism and creativity. While other primates are capable of using simple tools - such as using a twig to get ants out of an ant hole - humans are able to create and use complex tools, such as cars and computers. Other notable differences between humans and other primates are that humans have drastically smaller jaw bones and jaw muscles due to differences in dietary habits. Humans also have shorter digestive tracts than other primates because of the food that we eat.

Evolution of Humans

Scientists continue to learn more about the evolution of humans and our hominoid ancestors. Currently, more than twenty different species of extinct hominins closely related to humans have been identified. Hominins are hominoids that are related to humans. The oldest distinct hominin is around 6-7 million years old. We won't look at all of these human ancestors but will rather highlight a few distinctive species.

There is some overlap as to when Homo habilis and Homo erectus lived
Homo Erectus and Homo Habilis

Let's first look at Australopithecus. This hominin lived about two to four million years ago, was bipedal, and had human-like hands and teeth but a small brain. Australopithecus increased the diversity of hominins. You may be familiar with an example of this human ancestor already. The infamous Lucy, discovered in Ethiopia in 1974, is a prime example of Australopithecus.

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