migration
noun
[ mʌɪˈɡreɪʃ(ə)n ]
• seasonal movement of animals from one region to another.
• "this butterfly's annual migration across North America"
Similar:
relocation,
resettling,
population movement,
transhumance,
moving,
moving abroad,
emigration,
expatriation,
posting,
exodus,
departure,
hegira,
defection,
trek,
diaspora,
Völkerwanderung,
passage,
flight,
run,
• movement from one part of something to another.
• "there is virtually no cell migration in plants"