Humans are primates. A primate is a kind of animal with forward-facing eyes, a collar bone, hands with thumbs, flat nails instead of claws, and a relatively large brain. Primates are a broad group of animals that includes apes, humans and small furry monkeys.
Primates are a subgroup of mammals, a group of animals that have hair or fur, warm blood, and a four-chambered heart and that nurse their young using mammary glands. While humans share many traits with other members of the primate group, they also have many unique features. For example, humans are adapted to walk on two legs, while most primates only walk on two legs when carrying objects if they do so at all. Humans have a much larger brain-to-body-size ratio than other primates.