The Yellow—rumped Warbler is aptly named for the yellow patches on the males' rumps. Females have fainter yellow patches and are grey—colored, while males have bright yellow patches and are blue—colored. Look for the Yellow—rumped Warbler, about 5 1/2 inches in length, perched on fences or foraging on bushes and grasses for insects.
Fun Fact There are two varieties in North America, both of the same species. The Audubon's Warbler, native to the West, has a yellow crown, chin, and throat. The Myrtle Warbler has a white chin and throat, and although its native to the East, it is often spotted migrating along the Pacific Coast during winter.