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Worm-eating Warbler Helmitheros vermivorus

Flight call description A high, abrupt, buzzy, slightly rising "dzit" often given in a quick series of two or three (especially by foraging birds).


Fig.1. Virginia September 19, 1993 (MO). 

Bird in flight.


Examples     Diurnal 


Similar species Often distinctively higher-pitched and with a finer, drier buzz than other calls in the zeep complex. See Blackburnian and Cerulean Warblers and 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=10) were 37.9-62.6 (45.8) mS in duration and in the 6.2-9.6 (6.9-8.9) kHz frequency range. The frequency track was level or slightly rising and double-banded, though the upper band was often faint. It is modulated with 2-5 (3.5) humps with a spacing of 9.5-13.6 (11.8) mS and a depth of 1.2-1.9 (1.6) kHz. Modulation peaks typically leaned slightly to the left, and troughs were softly v-shaped.