The nests are usually cup-shaped, and loosely built of twigs and grasses woven together, but some are compact structures of plant down. The female warbler lays from three to six eggs, which are whitish with brownish markings at the larger end. Many kinds of warblers have fine singing voices. Others sing only weak, lisping notes. There are more than 150 species and subspecies of warblers.
Yellow warblers are quite common in city parks.
The yellow-rumped warbler has four yellow patches on its head, rump, and breast. Some kinds of warblers Another well-known warbler is the American redstart. It is colored a striking black with salmon markings, and looks somewhat like a small oriole. The redstart is one of the most active and graceful of American warblers. The Blackburnian warbler has a bright orange throat.