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Cerulean Warbler Dendroica cerulea
Flight call description A relatively low, abrupt, buzzy "dzzt".
Fig.1. Texas April 24, 2001 (MO).
Similar species Very similar to Yellow, Blackpoll, and Connecticut Warblers but typically more abrupt and often with audibly deeper modulations. Similar to Worm-eating Warbler but lower-pitched and with a coarser buzz. See zeep calls.
Behavior Primarily a nocturnal migrant but engages in redetermined migration. Gives flight call regularly while perched and in flight during the day and presumably during nocturnal migration.
Spectrographic description Measured calls (N=5) were 35.1-64.0 (49.0) mS in duration and in the 6.0-8.3 (6.3-8.0) kHz frequency range. The frequency track was level or slightly sloped and modulated with 2-4 humps with a spacing of 11.8-13.6 (12.8) mS and a depth of 1.4-1.7 (1.5) kHz. Modulation troughs were evenly u-shaped.