After training, nine out of Gentner’s 11 songbirds picked out the birdsong with inserted warbling or rattling bird phrases about 90 percent of the time.

An unmarked vireo, the warbling is most often located by its song, which it delivers for hours. The birds tend to work mid and top parts of broad, leafy trees. Polytypic. Length 5.5". Identification ...

More than a dozen varieties of bird feeders and nesting boxes are positioned around the property and attract a symphony of chirps, whistles and warbling bird sounds.

Dressed in muted colors, the warbling vireo's intricate song is more impressive than its appearance. Known as a persistent singer, it will even sing while sitting on its nest.