Meaning: This sentence describes a bird migrating south to escape the cold of winter.
Choice of Words: Migrates is a verb that means to move from one place to another, especially for a long distance. South is a noun that refers to the direction opposite north. Winter's is a noun phrase that refers to the season of winter. Chill is a noun that refers to the coldness of the air. Escapes is a verb that means to get away from something.