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". Among the ...

This is a large, colorful vireo and a strong, though slow-paced, singer. It moves sluggishly, which combined with its camouflaged coloration, can make it difficult to locate high in the leaves of ...

Although it is federally protected and there has been an important surge in the least Bell's vireo population in Southern California, the bird remains susceptible to habitat destruction from the likes ...

Every spring since 1969, Dartmouth researchers produced hand-drawn maps of songbird territories in New Hampshire's Hubbard Brook Experimental Forest by listening for their distinctive calls. Fifty ...