sentence: Humans are bipedal, which means they walk on two legs.
sentences_before: Biologists since Linnaeus put humans in the animal order of primates. Apes are also primates, and are the nearest animal relations to humans. Humans, like other primates, are social animals.
sentences_after: Humans have a complex brain, which lets them use language, make ideas, and feel emotions. This brain, and the fact that arms are not needed for walking, lets humans use tools, which they do more than any other species.
concept_name: human
headings: Human
categories: Hominins