(Dendroica petechia) is a New World warbler species or superspecies; Sensu lato, they make up the most widespread Dendroica species, breeding in almost the whole of North America and down to northern South America.
Yellow Warblers breed in most of North America from the tundra southwards, but they do not range far southwestwards and avoid the Gulf of Mexico coasts also. The Mangrove and Golden Warblers occur to the south of it, to the northern reaches of the Andes. Yellow Warblers winter to the south of their breeding range, from southern California to the Amazon region, Bolivia and Peru.
Yellow Warblers arrive in their breeding range in late spring - generally about April/May - and move to winter quarters again starting as early as July, as soon as the young are fledged.
The breeding habitat of Yellow Warblers is typically riparian or otherwise moist land with ample growth of small trees, in particular willows (Salix). The other groups, as well as wintering birds, chiefly inhabit mangrove swamps and similar dense woody growth. Less preferred habitat are shrubland, farmlands and forest edges.
Source: en.wikipedia.org/wiki/Yellow_Warbler – 23.11.2011