The Northern Yellow Warbler is one of the brightest jewels of Arizona’s riparian habitats. Males glow with golden plumage and fine chestnut streaks on the breast, while females and immatures are paler yellow-green. During spring migration, their sweet, whistled song—“sweet-sweet-sweeter-sweetest”—echoes from cottonwoods, willows, and sycamores along streams and desert washes. They are among the first warblers to return in spring, arriving as early as late March to establish breeding territories. Nesting low in shrubs or small trees, they build a compact cup of plant down and grasses. Yellow Warblers feed primarily on insects, gleaning caterpillars and small flies from leaves and twigs. Their presence is a strong indicator of healthy riparian vegetation. In late summer, they depart for wintering grounds that stretch from Mexico deep into South America.
Female