The Yellow Warbler (Dendroica petechia), is a New World warbler. It is the most widespread Dendroica species, breeding in almost the whole of North America and down to northern South America. It is found in the whole of temperate North America as far south as central Mexico in open, often wet, woodland or shrub. It is migratory, wintering in Central and South America. This form is a very rare vagrant to western Europe.
It is 4.5 inches long and weighs 9 grams (0.3 oz). The summer males of this group are greenish above and yellow below, with red breast streaking.
The Yellow Warbler has 35 subspecies, which can be divided into three main groups. Each of these groups is sometimes considered a separate species.