Among North American wood-warblers (family Parulidae), usually only the males sing, although female song has been documented in a few well-studied species, such as the Yellow Warbler. Wood-warbler songs are usually rather high-pitched and often include a series of notes or trills. The songs of many species contain emphatic inflections, often at the end, while other species give monotonous trills. Read More...
David Sibley had wanted to create his own bird guide since he was a teenager,
and spent most of the 1980s and 1990s traveling around North America watching
and sketching birds. The knowledge he gained in the field during those years
allowed him to create the nearly 7000 illustrations in the Sibley Guide to Birds,
published in 2000.
The result of over ten years of field work and six years
of painting and writing, the Sibley Guide to Birds is generally recognized as
an indispensible resource for both new and experienced birders. David's personal website
can be found at www.sibleyguides.com.
Among North American wood-warblers (family Parulidae), usually only the males sing, although female song has been documented in a few well-studied species, such as the Yellow Warbler. Wood-warbler songs are usually rather high-pitched and often include a series of notes or trills. The songs of many species contain emphatic inflections, often at the end, while other species give monotonous trills. 
David Sibley had wanted to create his own bird guide since he was a teenager,
and spent most of the 1980s and 1990s traveling around North America watching
and sketching birds. The knowledge he gained in the field during those years
allowed him to create the nearly 7000 illustrations in the Sibley Guide to Birds,
published in 2000.
