Some warblers are specialists. These birds virtually always take their insects from one particular part of a tree. Blackburnian Warblers glean for insects in the canopy of trees, especially on small twigs and leaves. Magnolia Warblers feed at low and medium levels, especially in the understory, and catch many flying insects. Chestnut-sided Warblers take insects from the undersides of leaves, especially in low and medium levels.
Ovenbirds feed on the forest floor, probing around and under fallen leaves for food items.
There are about 115 species of warblers in the Americas, of which about 60 occur north of the Mexican border. Many of these are secretive and hard to find, but two species breed over most of the United States and Canada. It can be found in weedy, brushy, or marshy habitats. The Yellow Warbler used to have as broad a range as the yellowthroat, but has been extirpated from parts of the Southwest and its range in shrinking in the Southeast. It nests just about anywhere it can find a stream, pond, lake, or river, especially where there are willows.