nomad
/ˈnəʊmad/
noun
a member of a people that travels from place to place to find fresh pasture for its animals and has no permanent home.
Many things can push you to leave your nest, regardless of time and place. Thousands of years ago people did it out of necessity – to feed their livestock, shy away from cold winters, sell merchandise, hunt, colonize new lands, etc. Today, despite living in cozy apartments surrounded by technology and automation, people still do it.