Blue-gray Gnatcatcher Song

Rambling chips, whistles and mewing notes
Soft, high pitched, difficult to hear
Includes phrases of other species (mimic) (Kershner, W. L. and W. G. Ellison 2020)

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References:
Kershner, E. L. and W. G. Ellison (2020). Blue-gray Gnatcatcher (Polioptila caerulea), version 1.0. In Birds of the World (A. F. Poole, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.buggna.01