Why does the poet choose to call the cuckoo a wandering voice?

The poet, William Wordsworth, addresses the cuckoo as the Blithe Newcomer' in the beginning of the poem. He calls it a newcomer because its song captivates and moves him to supreme spiritual joy. ... He calls the cuckoo a wandering voice because it wanders from hill to hill.

Explanation:

The poet chose to call the cuckoo a wandering voice because it wanders from hill to hill.

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