Northern Parula

About the Northern Parula

The Northern Parula is one of the smallest warblers in North America, a compact, short-tailed bird easy to overlook if not for its bright colors. It shows bluish-gray upperparts broken by a yellow-green patch on the back, a yellow throat and breast, and a clean white belly and undertail. Males display a dark chestnut-and-black band crossing the breast that females show only faintly or not at all, and both sexes have bold white crescents above and below the eye along with a two-toned bill that's yellow on the lower half — small details that separate it from other yellow-throated warblers at a glance.

This species breeds across most of eastern North America, from Florida north into the Canadian boreal forest, though it's notably absent from parts of the upper Midwest and Northeast where its required moss or lichen substrate is scarce. In Oklahoma it breeds across the eastern half of the state, favoring riparian corridors and bottomland forest along rivers and creeks. Wherever it occurs, its presence tracks closely with hanging epiphytic growth: Spanish moss draped over live oaks and cypress in the South, and beard lichen hanging from conifers and hardwoods farther north. It's a long-distance migrant, wintering from Mexico through the Caribbean and into Central America.

Parulas forage energetically and often acrobatically, working quickly along twigs and leaf clusters and sometimes hanging upside down from a branch tip like a chickadee to reach a hidden insect. Caterpillars make up a large share of the diet, especially the soft green larvae fed to nestlings, supplemented by spiders and a broad mix of flying and crawling insects; on the wintering grounds it will also take small berries or sip nectar.

Its nesting habit is one of the more unusual among American warblers: rather than building a freestanding cup nest in a branch fork, the female instead hollows out a small pocket directly inside a hanging clump of moss or lichen, lining the cavity with fine plant fibers, hair, or pine needles. The result is a nest that's almost invisible from the outside, camouflaged as just another clump of moss swaying in the same tree. Pairs frequently return to the same nesting territory, and sometimes the very same clump of moss, in successive years. In spring, males announce themselves with a distinctive rising, buzzy trill that seems to climb upward before snapping off at the top — one of the more recognizable and easily learned songs of the eastern forest understory.