Atzil et al. define humans as social creatures. We work together and move together in synchrony to promote homeostasis through allostasis. Atzil et al. posit that we are not born with a "social Brain" but learn to be social creatures as we understand that sociality and dependence upon one another is necessary for our survival.
Being social creatures indicates a reliance and care for one another and the choice to bond with others and to invest in long-term relationships with others. By this definition, most mammals and birds are social creatures who create bonds with each other, help each other, and care for their young in order to survive. This creates an interesting field of study into group behavior and how we affect each other socially. (Atzil et al, 2018)