The Blue-gray Gnatcatcher (*Polioptila caerulea*) is a tiny, energetic songbird found across much of the United States, Mexico, and parts of Central America, distinguished by its slate-blue upperparts, white underparts, a long black tail edged in white that it flicks and fans almost constantly, and a thin white eye-ring; true to its name, it feeds mainly on gnats, midges, spiders, and other small insects, gleaned acrobatically from leaves and twigs in deciduous woodlands, scrub, and gardens, and it builds a remarkably neat, cup-shaped nest camouflaged with lichen and spider silk, often mistaken for a hummingbird's nest.