Human beings behave the same way.
We all want to feel safe and secure, but as we get older, we realize that we cannot always count on things being the same. We experience different incidents in our lives that turn our world upside down and cause us to feel stress. Most of these incidents we cannot control, others we can control to a certain degree. Some of us are fortunate enough not to experience these stressors until adulthood. Others experience stress as young children.