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Lucy’s Warbler (Leiothlypis luciae) perched on a leafy mesquite branch against a clear blue sky in Arizona. This tiny desert warbler is pale gray with a faint eye-ring and subtle rufous crown and rump, often hidden from view. Closely tied to mesquite bosques and riparian corridors, it gleans insects among the branches and nests in cavities or behind loose bark. Protecting riparian habitats and desert trees is vital for conserving Lucy’s Warblers, sustaining pollinators, and preserving fragile desert ecosystems under pressure from climate change.