This video from the USA says about itself:
22 July 2015
Yellow Warblers shine with golden yellow, and are often easily viewed as they sing from prominent perches and forage in low brushy vegetation. This warbler can be found throughout most of the U.S. and Canada during spring and summer, especially in wetland and riparian habitats.
While many warblers show some yellow in their plumage, the aptly named yellow warbler is the brightest and most extensively yellow one of all. This bird also has the widest range of any North American warbler, which brings its brilliant color to millions of birders every year: here.