Bird vocalization includes both bird calls and bird songs. In non-technical use, bird songs are the bird sounds that are melodious to the human ear. In ornithology and birding, (relatively complex) songs are distinguished by function from (relatively simple) calls.
Read more about Bird Vocalization: Definition, Anatomy/Physiology, Function, Learning, Neuroanatomy, Auditory Feedback in Birdsong Learning, Identification and Systematics, Recording, Bird Language, Bird Song and Music
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“And the one bird singing alone to his nest,
And the one star over the tower.
I thought of our little quarrels and strife,
And the letter that brought me back my ring;
And it all seem’d then, in the waste of life,”
—“Owen” “Meredith” (1831–1891)