The additional line that best matches the stanza from the poem "The Caged Bird" is:
- "and he drifts among the cottony clouds"
This line fits well with the peaceful and free imagery depicted in the original stanza. It continues the theme of the free bird enjoying the natural elements and exploring the sky. The phrase "cottony clouds" evokes a sense of softness and tranquility, aligning with the gentle and serene tone of the passage. The image of the bird drifting among the clouds adds to the feeling of freedom and grace portrayed in the poem.