OK . . . I guess it's an assignment about "I Know Why the Caged Bird Sings" by Maya Angelou . . . or that can be your reference . . . Symbolism transposes one set of circumstances for another. The bird is caged, imprisoned, but still singing, still engaged with life. Why would it do that? Assignments like this intend to sharpen YOUR critical thinking. If you find it difficult, break it down and connect the vocabulary: bird, song, cage. And don't copy and paste my answer . . . !