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The female cowbird may continue to observe this nest after laying eggs. Some bird species have evolved the ability to detect such parasitic eggs, and may reject them by pushing them out of their nests, but the female cowbird has been observed to attack and destroy the remaining eggs of such birds as a consequence, dissuading further removals.
Different host species show different responses to their nests being parasitised, with behaviours ranging from accepting and caring for the cowbird eggs, to rejecting the eggs from the nest. [2] As the shiny cowbird is an effective generalist brood parasite, it can be considered the South American counterpart to the brown-headed cowbird.
The brown-headed cowbird eggs have been documented in nests of at least 220 host species, including hummingbirds and raptors. [14] [15] More than 140 different species of birds are known to have raised young cowbirds. [16] The young cowbird is fed by the host parents at the expense of their own young.
The nest is constructed with grassy material, bark, and dry leaves, and lined with softer material such as moss and hair. The female is responsible for most of the nest-building. [3] The female lays four or five eggs, [2] which are light brown and speckled with darker brown. The female begins incubating once the last or second-to-last egg is laid.
Nightjars are medium-sized nocturnal birds that usually nest on the ground. They have long wings, short legs, and very short bills. Most have small feet, of little use for walking, and long pointed wings. Their soft plumage is cryptically colored to resemble bark or leaves. Two species have been recorded in Yellowstone.
Beka Setzer, an Ohio mother of two young daughters, took to Facebook last summer to share shocking photos of her daughter Emmalee's legs after a day spent playing outside went awry. "PSA," she wrote.
The screaming cowbird has mildly iridescent black plumage; the lesser under-wing coverts are rufous. The female is slightly duller in colour than the male. The legs are black and the iris is reddish brown. Adult body length is 18–21 cm and mean adult weight is 58 g for males and 48 g for females. [3]