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Angelou uses the metaphor of a bird struggling to escape its cage, described in Paul Laurence Dunbar's poem, as a prominent symbol throughout her series of autobiographies. Like elements within a prison narrative, the caged bird represents Angelou's confinement resulting from racism and oppression.

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The caged bird in Maya Angelou's poem sings to express itself.

Maya Angelou’s poem “Caged Bird” is a symbol of African Americans who are "caged" in their own land by the whites. The symbol of the cage in the poem depicts the restriction of the society. Meanwhile, the caged birds sing the song of liberty and are compared with free birds. So that, the principal theme of “Caged Bird” is freedom.

Angelou's poem employs the metaphor in order to convey the idea that freedom is a natural state and knowledge of this fact cannot be undone by any amount of oppression or imprisonment.