Dunnock
- The hedge sparrow's mating system includes monogamy, polyandry, polygyny, and their combinations. In observations by British ornithologists, 42 % of birds were monogamous, 30 % polyandrous, 4 % polygynous, and 24 % polyandrous.
Age
The dunnock’s typical lifespan ranges from 15 years and 7 months to 26 years, with a maximum recorded lifespan of 20 years and 10 months, although its theoretical lifespan is between 7 years and 9 months and 11 years and 1 month. The species reaches sexual maturity from 9 months and 1 week to 1 year and 3 months. An embryo develops inside an egg, after which the young are nestlings that receive food from their parents for a period of 1 week and 3 days to 2 weeks. Following this, the young enter a stage of rapid growth, lasting from 1 to 3 months, during which they learn to fly and forage for food. The adult stage, when the species is capable of reproduction, lasts from 1 to 7 years.
Phenotype
The dunnock has soft down covering its body as a chick, and the chick’s mouth is brightly colored to help parents locate it in the nest; young dunnocks exhibit plumage that is more mottled and duller than that of adults. Adult dunnocks possess a thin dark beak which aids in collecting small insects and seeds, and their legs are thin and pinkish-brown, allowing for quick movement on the ground. The adult’s plumage is brown on the back with dark speckles, gray on the head and chest, and light on the belly; the wings are short and rounded, suitable for flight among bushes.
Physiology
The forest warbler is a bird species characterized by a body length of from 14 to 15 cm and a weight of from 18 to 19.8 g, as well as a wingspan of 21 cm. In the "Embryo" stage, body weight is observed from 2 to 2.5 g and body length from 1.9 to 2.1 cm; in the "Nestling" stage – body weight from 8 to 18 g and body length from 10 to 13 cm. The "Juvenile after rapid growth" stage has a body weight of from 16 to 22 g and a body length of from 13 to 14 cm, and in the "Adult" stage, body weight is from 19 to 25 g, body length – from 14 to 15 cm.
Habitat
The dunnock occupies habitats at elevations up to 2 kilometers. The species is found in temperate mixed forests with warm summers and many oak, birch, and maple trees; flooded meadows where water frequently covers the ground and there is abundant grass; and taiga forests characterized by cold winters and numerous coniferous trees such as spruce and pine. It lives on land and within terrestrial forests. The climate varies, including consistently wet conditions with frequent rain and high humidity, and cool summers with snow in winter; summers are also described as warm with plentiful rain; summers can be warm and winters not very cold; and summers can be comfortable, with temperatures ranging from 20 to 25 degrees Celsius.
Shelter
Dunnocks are found in dense bushes or living hedges at heights from 0.5 to 2 meters. The species builds or uses a nest, which is a structure for laying eggs and raising young. Nesting structures are made of twigs, moss, and grasses.
Geography
The dunnock is found within the Palearctic biogeographical region and occupies several ecosystems, including Celtic broadleaf forests, broadleaf forests of Western Europe, Baltic mixed forests, European Atlantic mixed forests, Sarmatian mixed forests, and Ural mountain forests and taiga.
Feeding
The forest warbler feeds on small insects, spiders, worms, and plant seeds. In winter, it more often switches to seeds. The method of obtaining food is searching for it on the ground under bushes and in fallen leaves. Its diet consists of insects, spiders, worms, seeds, coniferous cones, and plants. The feeding strategy is searching for and obtaining food. Daily food requirement is from 15 g to 25 g. Prey species include beetles, butterflies, diptera, hymenoptera, bedbugs, orthoptera, dragonfly, mayfly, lacewings, amphipods, ribbon worms, and sucking worms.
Reproduction
The dunnock’s embryo develops for 6 days; the female lays 4 to 5 blue eggs in a nest. A clutch has 3 to 5 young, and both parents feed the chicks. The species frequently exhibits polyandry, where one female mates with two or three males. The female produces 3 to 5 broods. The interval between breeding seasons is from 9 months and 1 week to 1 year and 2 months. Maturity occurs from 10 months to 1 year and 1 month.