Human

Walking upright on two legs.
Humans are the only animals that habitually walk on two legs, a trait that evolved over millions of years as an adaptation to diverse environments and changing climates.

Using tools and manipulating food.
Humans are among the most proficient tool users in the animal kingdom, and the only ones that make and use complex tools for various purposes, such as hunting, cooking, and building.
Humans also have a unique ability to manipulate food, such as processing, cooking, and preserving it, which has implications for their nutrition, health, and culture.

Having large and complex brains.
Humans have the largest brains relative to their body size among all animals, and their brains are also highly complex and specialized for various cognitive functions, such as language, reasoning, memory, and creativity.
Humans use their brains to communicate with symbols, such as words, gestures, and art, and to create and transmit knowledge, beliefs, and values across generations.

Living in social groups.
Humans are social animals that depend on each other for survival and well-being.
Humans form various types of social groups, such as families, clans, tribes, nations, and organizations, and cooperate and compete with each other within and across these groups.
Humans also have a sense of morality, justice, and empathy, which guide their social behavior and interactions.

Changing the world.
Humans are the most influential and dominant species on Earth, and have the ability to alter their environment and affect other living beings in positive and negative ways.
Humans have domesticated plants and animals, invented agriculture, industry, and technology, and created civilizations, cultures, and religions.
Humans also face many challenges and opportunities in the present and future, such as population growth, climate change, globalization, and innovation.

A bipedal posture, meaning they walk on two legs.

An opposable thumb, which allows them to grasp and manipulate objects.

A large and complex brain, which enables them to think, communicate, and create.

A hairless body, except for the head, eyebrows, eyelashes, and some parts of the face and genitals.

A wide range of skin, hair, and eye colors, influenced by genetics and environmental factors.

Genetic, ethnic, and geographical ancestry, which determine the shape and size of the bones, muscles, organs, and facial features.

Age, lifestyle, and disease, which can cause changes in the skin, hair, teeth, and body shape.

Personal adornment, such as clothing, jewelry, cosmetics, body art, and body modification, which can express the individual's identity, culture, and preferences.