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The common blackbird is the national bird of Sweden, [citation needed] which has a breeding population of 1–2 million pairs, [16] and was featured on a 30 öre Christmas postage stamp in 1970; [67] it has also featured on a number of other stamps issued by European and Asian countries, including a 1966 4d British stamp and a 1998 Irish 30p ...
Deep cup nest of the great reed-warbler. A bird nest is the spot in which a bird lays and incubates its eggs and raises its young. Although the term popularly refers to a specific structure made by the bird itself—such as the grassy cup nest of the American robin or Eurasian blackbird, or the elaborately woven hanging nest of the Montezuma oropendola or the village weaver—that is too ...
Males defend small territories, usually around 3 metres, during the nesting period. Before the nesting period males defend slightly larger territories to repel other males. [6] Yellow-shouldered blackbirds engage in anting, a rare behavior only observed in the Puerto Rican tanager among West Indian birds. [7]
Brewer's blackbirds often walk along the ground. They can be seen making jerking motions with their heads. In colder months, these birds tend to flock together and forage. Sometimes, other species of blackbirds will join these flocks. During nesting season, their foraging behavior becomes more independent.
Yellow‐headed blackbirds have been found to be sensitive to nest predation risk, for example by marsh wrens (Cistothorus palustris), and alter their nest attendance behavior accordingly. [13] Raptors occasionally prey on yellow-headed blackbird flocks. [14]
Flocks of black birds have been spotted in backyards and parks over the past few weeks in the Triangle, causing many of us to do a double take when we leave our homes or pass a large, grassy field.
Thyroid Histology of Tricolored Blackbirds Agelaius-Tricolor in the Annual Cycle Breeding and Molt. Condor. vol 72, no 4. p. 445–451. Powell Gun. (1974). Experimental Analysis of the Social Value of Flocking by Starlings Sturnus-Vulgaris in Relation to Predation and Foraging. Animal Behaviour. vol 22, no 2. p. 501–505.
After mating, the birds build a nest on the ground. The female lays one egg and both parents incubate the egg. After the chick hatches, it goes to live in a nursery with other chicks.