She also observed behaviors such as hugs, kisses, pats on the back, and even tickling, what we consider 'human' actions. Goodall insists that these gestures are evidence of "the close, supportive, affectionate bonds that develop between family members and other individuals within a community, which can persist throughout a life span of more than 50 years". These findings suggest similarities between humans and chimpanzees can be seen in emotion, intelligence, and family and social relationships.