Sub-category: Wood Warblers
A bright yellow new world warbler. These birds feed mainly on arthropods, in particular insects. They acquire prey by gleaning in shrubs and on tree branches, and by hawking prey that tries to fly away. To humans, these birds are quite beneficial. The young devour many pest insects during the breeding season. It may be between 3.9 to 7.1 inches long, with an average wingspan of about 7.9 inches. They weigh 0.25 to 0.88 oz, varying between subspecies and whether on migration or not. The summer males of this group are generally the yellowest warblers wherever they occur. They are brilliant yellow below and golden-green above. There are usually a few wide washed-out rusty-red streaks on the breast and flanks.
The breeding habitat of yellow warblers is typically riparian or otherwise moist land with ample growth of small trees, in particular willows.