Female song in the hooded warbler

One female Hooded Warbler (Wilsonia citrina) was discovered singing in July 1993, and another in May 1996 among a color-banded breeding population under investigation. The first female\u27s song structurally resembled the typical male Hooded Warbler mixed-mode song in duration, frequency range, and number of syllables, although it had an atypical raspy quality. Males responded similarly to playbacks of the female song and a male song from the same population. We suggest that age and high breeding density may be explanatory factors for this rare behavior