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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“A Bird came down the Walk—
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—Emily Dickinson (1830–1886)