Spending much of its time walking on the shady forest floor among leaf litter and fallen logs, the Ovenbird breeds in mature woodlands and builds unique, well camouflaged, domed nests of leaves and grass on the forest floor. The domed nest resembles a Dutch oven and gives this bird its common name. The Ovenbird’s distinctive loud, repetitious tea-cher!, tea-cher!, tea-cher! song is a familiar sound in forests of eastern North America, and can be heard for quite some distance. Its scientific name translates to a ‘capped tail-wagger’ referring to the birds habit of cocking its tail upward and its dull orange central crown stripe. This warbler seems to require large, contiguous forests for successful breeding.
This bird primarily nests in deciduous or deciduous/coniferous forests of many different plant community types with deciduous tress as a chief component. Of primary importance for breeding is a large area of contiguous, interior forested habitat. It is a neotropical migrant that winters mainly in parts of Mexico, Central America and the Caribbean. Neotropical (New World) migratory birds breed during summer in temperate North America, migrating north each spring from wintering areas, then fly back south to spend the bulk of the year in Mexico, Central or South America, or the Caribbean.
Despite loss of habitat through forest fragmentation on the breeding grounds, Ovenbirds increased in abundance in the eastern United States in the 1960’s and 70’s. These increases were greatest in Canada, and the northeast. However, Breeding Bird Survey (BBS) results indicate Ovenbirds have declined significantly in many areas of the east, especially at edges of their breeding range during the same period. Long term BBS results over the last 35 years show the birds basically holding their own, but declines coming in most recent years.
This large warbler has grayish olive upperparts and white underparts with blackish-streaked spots on the lower throat, breast and sides. It has pinkish legs, and a distinctive white eye-ring that helps distinguish it from waterthrushes. Young birds are usually less brightly colored and sexes are identical.
On the breeding grounds, the Ovenbird inhabits forested habitats, which are usually mature in nature. They typically nest in forests which are chiefly deciduous in a variety of different plant community types. Many reports of nighttime kills at towers indicate this species is a nocturnal migrant. During winter it is primarily found in primary and secondary forests, usually with plenty of leaf litter.
The territorial song of the Ovenbird is a loud, ringing ‘Teacher-Teacher’ phrase. There is quite a bit of variability among members of a given population, which makes individual birds recognizable. The primary song is often given when a male is close to a female, and it consists of a series of repetitions of a single phrase. This song functions mainly to attract females to unmated males and to proclaim and defend a territory.
Nests are well camouflaged due to placement, structure and the materials used in construction. The domed nest is built on the ground by the female, and has side entrance that is invisible from above. Grasses, slender woody and herbaceous stems, moss and bark pieces are all used in construction, with dry leaves a major component of the actual nest. Animal hair is often used to line the nest cup.
Forest invertebrates are the main food taken. This species depends on leaf litter on forest floors on both breeding and wintering areas for foraging. The foraging areas may be somewhat bigger than song territories, which are often related to food availability. Ovenbirds evidently can use structural vegetation clues to assess habitat quality as it relates to available food resources. Research has shown that Ovenbirds ‘learn’ where high concentrations of food exist and repeatedly visit those sites.
The Ovenbird breeds in northern and northeastern North America and winter in southern Florida, Mexico, Central America and the Caribbean islands. Most are thought to migrate along the Mississippi and Atlantic flyways. It is found as a breeder throughout North Carolina except for the southeastern part of the lower Coastal Plain. It is also an occasional wintering species around the Cape Hatteras area.
Good data does exist documenting collisions with TV towers and buildings from this nocturnal migrant. Reduction of large, contiguous tracts of forest to smaller isolated fragments has interfered with breeding and may impact populations. Long term BBS data shows that since 1966 this bird has a stable overall population level, but those declines have occurred for certain years since 1966 in some areas. Research has shown that smaller forest patches usually have lower densities of territorial males and a lower percentage of mated males than do large forests. Ovenbirds evidently do not relate well to early successional or edge habitat, but population numbers seem to recover as forests regenerate. Further studies are needed that address the effects of forestry practices on Ovenbirds over time. Continued conversion of neotropical forests to pasture and croplands on the wintering grounds certainly will effect Ovenbirds numbers in the future.
Warblers of the Americas, by Curson,
Quinn and Beadle, 1994, Houghton Mifflin Co.
Peterson Field Guides: Warblers, by Dunn and Garrett, 1997, Houghton Mifflin Co.