Based on the information, it can be noted that the poetic technique that "Sonnet, With Bird" used was that the final two lines formed a rhyming couplet.
The poem was simply to express the theme that everyone is different in terms of their appearance and that feeling like an outsider will happen in the life of a person at a point in their life.
From the poem, it can be seen that the final two lines in the sonnet formed a rhyming couplet. The rhyming couplet redefined the thematic ideas harness expressed in the earlier lines.
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