Blackbirds

Blackbirds exploit a wide range of habitats. Most species occur in tropical forests of various sorts, but virtually all types of terrestrial and wetland habitats are utilized by some species. In North America, the northern oriole (Icterus galbula) is a species of open forests, where it builds its characteristic, pendulous nests, often in elm trees. The bobolink (Dolichonyx oryzivorus) and meadowlarks (Sturnella spp.) are more typical of open grasslands and prairies, while the red-winged blackbird (Agelaius phoeniceus) and yellow-headed blackbird (Xanthocephalus xanthocephalus) are typical of marshes and some other wet habitats.

The most widespread species is the red-winged blackbird, which ranges from the subarctic to Central America. This common and familiar bird breeds in tall marshes and other wet places. The male red-winged blackbird is colored as its name implies, with a jet-black body and richly red epaulets on the shoulders. Female red blackbirds have a streaky, brown plumage, and look much like large sparrows. After the breeding season, redwinged blackbirds aggregate into large flocks that forage widely for small grains, and can cause agricultural damage. Red-winged blackbirds generally spend the winter in these flocks, mostly in southern parts of their range, where they forage during the day and roost communally at night in woodlands and marshes.

The most northerly blackbird is the rusty blackbird (Euphagus carolinus), which in some places breeds as far as the limits of the mainland in the western Arctic. The most southerly species is the red-breasted blackbird (Leistes militaris) of the Falkland Islands.

Blackbirds that breed in the north are migratory. The longest migrations are undertaken by the bobolink. This species breeds in prairies and hayfields as far north as southern Canada, and winters in pampas and other grasslands as far south as Argentina. Tropical members of the blackbird family are not migratory, but they may undertake local, seasonal movements.

Cowbirds, such as the brown-headed cowbird (Molothrus ater) of North America, are species of open habitats. As their name implies, these birds often associate with grazing livestock, feeding on insects that these animals flush as they move through vegetation. Cowbirds have an unusual breeding strategy. Instead of building their own nest and raising their young, cowbirds are A male brown-headed cowbird in Kirtland's warbler breeding territory near Mio, Michigan. Because the cowbird lays its eggs in the nests of other birds, where its aggressive hatchlings often out-compete their nest mates for food, the cowbird has been identified as a factor in the decline of the Kirtland's warbler, an endangered species known only to nest in north-central Michigan. Photograph by Robert J. Huffman. Field Mark Publications. Reproduced by permission. nest parasites. They surreptitiously lay single eggs in the nests of other species, and sometimes remove eggs of the host bird. If the host birds do not recognize the cowbird egg as being alien, they will brood it and care for the hatchling until it fledges. Many of the approximately 200 species of birds known to be parasitized by the brown-headed cowbird are relatively small, such as vireos, warblers, and thrushes. The nestlings of these birds suffer as a result of the disproportionate demands placed by the voracious cowbird chick on its foster parents, and in many cases this causes the reproductive effort of the host birds to fail. The cowbird chick develops rapidly, and can fly in only nine or ten days after hatching.

Outside of the Americas, the blackbird (Turdus merula) of Europe, is actually a member of the thrush family, Turdidae.