Orange-crowned Warbler Vermivora celata
Flight call description A dry, clear, rising "ssit" with a soft beginning and abrupt ending.
Fig.1. Maryland October 18, 1992 (MO).
Perched bird foraging.
Examples Diurnal
Similar species See Tennessee Warbler and short rising seeps.
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=9) were 40.9-55.7 (47.2) mS in duration and in the 5.6-10 (6.6-8.7) kHz frequency range. The frequency track was double-banded and rising. It varied from upward-arched to downward-arched to slightly s-shaped. Separation between bands ranged from 500-700 Hz. Calls were usually unmodulated but occasionally showed fine modulations with a spacing of 2.9-6.8 (4.9) mS between humps.