Lucy’s warbler (Oreothlypis luciae) was named after Lucy Hunter Baird, the daughter of ornithologist Spencer Fullerton Baird.
Summering and breeding in the Sonoran Deserts of the Southwest, Lucy’s warblers winter in Mexico. Their habitat is dense cottonwood, willow and mesquite woodlands, most often in riparian areas, where they forage at the tops of trees and the ends of branches.
A monotypic (males and females look alike) songbird, Lucy’s warblers are grey above and white or buffy below. Their rufous rump and chestnut crown patch are often concealed. The white eye ring is indistinct. There is a small white spot near the tip of the outer tail feathers.
The diet of Lucy’s warblers is almost entirely insects.
Only two warbler species build their nests in cavities, one being Lucy’s warbler. Cactus holes, woodpecker holes, verdin holes and other pre-existing cavities are used for nest construction. Lucy’s warblers do not use nest boxes.
A former scientific name for Lucy’s warblers was Vermivora luciae and this designation is common in the literature.
Bueno Aires National Wildlife Refuge AZ, where these pictures were taken, is the summer home of Lucy’s warblers. Thanks to the guy from Montana who pointed out and helped me identify the Lucy’s warbler.