This article discusses evidence of traits that humans and animal have in common, focusing specifically on communication and gestures. Specific examples and case studies are presented in this broad overview of related research.

This examination of the communication skills of animals shows that the gestures of hon-human primates are not reflexes, but learned, flexible, and voluntary behaviors that are the basis for human-like communication. Specific research pertaining to syntax, grammar, and other communication mechanisms are also covered, along with brief discussion about evidence of culture, mind-reading, emotions, tool use, morality, and personality among non-human primates.