Guide to North American Birds

Find a Bird

Photo: Rob Curtis/Vireo

Mourning Warbler

Geothlypis philadelphia

Often elusive and hard to see well, the Mourning Warbler sings a repetitious chant from thickets and raspberry tangles in the north woods. This bird lives near the ground at all seasons, foraging in low brush and in the forest understory even during migration; it tends to be solitary, not readily joining flocks of other warblers. It got its name because the extensive black throat patch of the male suggested to pioneer naturalists that the bird was dressed in mourning.

Conservation status	Current numbers probably stable. Because it inhabits shrubby second growth in both summer and winter, not as vulnerable as some warblers to loss of habitat.
Family	Wood Warblers
Habitat	Clearings, thickets, slashings, undergrowth. Breeds in brushy northern habitats, including dense shrubbery in old deciduous woods clearings, brushy cut-over lands, lowland thickets of raspberry and blackberry tangles, or bog and marsh edges; often in temporary habitats, growing up after fires or clearcuts. In winter in the tropics, lives in low, dense thickets and overgrown fields in lowlands and foothills.

Photo Gallery

Feeding Behavior

During the breeding season, forages primarily in shrubs within a few feet of the ground; hops while feeding on ground. Sometimes makes short flights to catch flying insects. Generally feeds alone rather than joining flocks.

Eggs

3-4, sometimes 5. Creamy white with brown spots or blotches. Incubated by female only, about 12 days. Male feeds female on nest during incubation. Young: Both parents feed nestlings. Young leave the nest after 7-9 days. Care of fledglings may continue for another 4 weeks or more.

Young

Both parents feed nestlings. Young leave the nest after 7-9 days. Care of fledglings may continue for another 4 weeks or more.

Diet

Probably mostly insects. Details of the diet are poorly known, but has been seen foraging for caterpillars, beetles, and other insects; also eats spiders. In winter in the tropics, sometimes feeds on the protein bodies from the leaf-bases of young cecropia trees.

Nesting

Details of the breeding behavior are not well known. Male sings to defend nesting territory; during territorial boundary encounters with rival males, he may bob violently, flip wings outward, and fan his tail. Nest: Usually placed on ground next to shrub at base of weeds in raspberry or blackberry briars, or among fern, goldenrod, or grass tussocks. Also sometimes in bush within a couple of feet of the ground. Nest (probably built by both sexes) is an open, bulky cup made of leaves, with a core of weeds and coarse grasses, lined with fine grass and hair.

Illustration © David Allen Sibley.
Learn more about these drawings.

Text © Kenn Kaufman, adapted from
Lives of North American Birds

Migration

In spring, apparently moves north overland through Mexico and Texas, rather than crossing the Gulf of Mexico like many other migrants; evidently retraces same route in fall. Migrates relatively late in spring and early in fall.

Download Our Bird Guide App

Migration

All Seasons - Common
All Seasons - Uncommon
Breeding - Common
Breeding - Uncommon
Winter - Common
Winter - Uncommon
Migration - Common
Migration - Uncommon

Songs and Calls

Loud, ringing, musical song, teedle-teedle, turtle-turtle, the last pair of notes lower.

Audio © Lang Elliott, Bob McGuire, Kevin Colver, Martyn Stewart and others.
Learn more about this sound collection.

How climate change could affect this bird's range

In the broadest and most detailed study of its kind, Audubon scientists have used hundreds of thousands of citizen-science observations and sophisticated climate models to predict how birds in the U.S. and Canada will react to climate change.

Learn more