Birds
Lucy's Warbler
Leiothlypis luciae · also called Lucy's warblers
Tucked behind a loose flap of mesquite bark, a Lucy’s warbler incubates its eggs completely out of sight, a hidden nesting strategy that sets this tiny desert warbler apart from nearly all of its more openly nesting relatives.
Overview
Lucy’s warbler, Leiothlypis luciae, is one of the smallest North American warblers, native to desert riparian habitat containing mesquite and willow across the southwestern United States and northwestern Mexico. Its unusual cavity-nesting behaviour, shared by only a handful of warbler species, makes it one of the more architecturally distinctive small songbirds in the desert Southwest.
A warbler that goes into hiding to nest
While most warblers build a visible cup nest in the open, Lucy’s warbler instead tucks its entire nest out of sight inside a cavity or behind loose bark, a genuinely uncommon strategy within a family better known for exposed nesting.
Status
Least Concern, though decreasing regionally — present across suitable desert riparian mesquite habitat throughout the southwestern United States and northwestern Mexico.
Lucy's Warbler: common questions
Why is Lucy's warbler unusual among North American warblers?
Lucy's warbler nests inside tree cavities, behind loose bark, or in similar hidden crevices, an unusual strategy shared by only a small number of North American warbler species, most of which build a more open, exposed cup nest instead.
How small is Lucy's warbler?
Lucy's warbler ranks among the smallest warbler species found in North America, notably compact even compared with other small warblers, making it one of the tinier songbirds found in its desert riparian habitat.
Why has Lucy's warbler declined in some areas?
Lucy's warbler has experienced regional declines linked to the loss of mesquite bosque habitat to agricultural and urban development, since the species depends closely on this specific desert riparian vegetation type for both nesting and foraging.
Where does Lucy's warbler live?
Lucy's warbler is native to desert riparian habitat containing mesquite and willow across the southwestern United States and northwestern Mexico, generally avoiding the higher-elevation forest habitat favoured by many other warbler species.