Kiertolaisens

Kiertolaisens, also known as house sparrows, are small, social birds belonging to the sparrow family Passeridae. They are native to Europe, Asia, and North Africa, but have been introduced to many other parts of the world, including North America, Australia, and New Zealand. Kiertolaisens are known for their adaptability and have successfully colonized a wide range of habitats, including urban areas, farmlands, and even deserts.

Adult kiertolaisens have a body length of about 16 cm (6.3 in) and a wingspan of 23 cm (9.1 in). They have a short, rounded tail and a stout, conical beak. The plumage of the male is generally more colorful than that of the female, with a gray head, brown back, and a white belly. The female has a more subdued brown and gray plumage. Both sexes have a black bib around the throat.

Kiertolaisens are granivorous, feeding primarily on seeds. They often forage on the ground, but will also feed in trees and shrubs. They are social birds and typically form large flocks, which can number in the thousands. These flocks can be seen gathering at bird feeders in urban areas, where they compete with other bird species for food.

Kiertolaisens are monogamous and form long-term pair bonds. They build their nests in protected locations, such as under eaves, in tree cavities, or in buildings. The female lays 3-7 eggs, which are incubated by both parents for about 12-14 days. The young birds, known as nestlings, fledge after about 14-18 days.

Kiertolaisens play an important role in ecosystems as seed dispersers. They help to distribute seeds from various plants, contributing to plant reproduction and regeneration. However, they can also be considered pests in some agricultural settings, as they may feed on crops and stored grain.