What does the word migrate mean?

Usage examples for migrate

  1. Moles shift their quarters according to circumstances, and as they swim well, they migrate across rivers; and in sudden inundations are able, not to save themselves alone, but their young, to which they are much attached. – Anecdotes of the Habits and Instinct of Animals by R. Lee
  2. Does not migrate, but is usually resident in the place where it can best provide for itself and family. – Stories of Birds by Lenore Elizabeth Mulets