Wryneck
- The Eurasian wryneck’s tail cannot serve as support on a vertical tree trunk because it is slightly curved and consists only of soft steering feathers. Therefore, the bird forages while sitting on branches or on the ground.
- The Eurasian wryneck’s offspring hatch asynchronously, and nestlings of different ages may be present in one nest. In the cramped cavity, they sit in a pyramid, beaks pointing toward the center, which open when parents touch them.
- The Eurasian wryneck produces hissing sounds similar to snakes and can rotate its neck strongly. Disturbed at the nest, it imitates a snake to defend itself.
- The Eurasian wryneck got its name for the behavior it displays in stressful situations. In such cases, it fluffs its tail, ruffles its feathers, lowers its wings, and attacks the aggressor, rotating its neck and making sounds.
- The Eurasian wryneck sometimes suffers attacks by large birds, such as the great spotted or Syrian woodpeckers. The cavity may be located up to 9 m above the ground.
- The Eurasian wryneck’s spring song resembles that of woodpeckers and hawks, but it is quieter and calmer. It consists of 12–18 monotonous drawn-out calls, repeated up to 4 times per second.
Age
The Eurasian wryneck’s typical lifespan is from 7 to 12 years and 6 months, although the maximum recorded lifespan is 10 years, with a theoretical lifespan of from 7 to 9 years and 1 month; the species reaches sexual maturity from 9 months and 1 week to 1 year and 3 months. The embryo develops inside an egg, and the young bird remains in a tree cavity, receiving food from its parents for a period of from 1 day to 2 weeks and 6 days. An adult wryneck can reproduce and forage independently, with the duration of this stage lasting from 1 to 12 years.
Phenotype
The Eurasian wryneck has grey-brown feathers with dark stripes that effectively camouflage the species against tree bark and branches. The adult possesses a short, strong beak which aids in capturing insects, and a flexible neck allowing for a wide range of head movements to inspect surroundings and deter predators. The young have downy feathers covering their bodies, a rare type of plumage. An adult’s long, sticky tongue is used to extract ants from narrow passages.
Physiology
The Eurasian wryneck measures between 15 and 18 centimeters in body length, with a wingspan of 26 centimeters; its mass ranges from 34.6 to 42.1 grams when adult, though the mass of an embryo is between 2 and 3 grams with a body length of 1.9 to 2.2 centimeters. During the nestling stage, the young’s body length varies from 4 to 12 centimeters and their mass ranges from 3 to 28 grams. The adult wryneck's mass is between 30 and 45 grams, and its body length remains consistent with the overall measurement of the species.
Habitat
The Eurasian wryneck occupies a terrestrial landscape, specifically mainland forests, and lives at altitudes up to 2 kilometers. The species thrives in temperate mixed forests with warm summers and many oak, birch, and maple trees, as well as flooded meadows where the ground is frequently inundated with water and abundant grass grows. It also inhabits taiga forests characterized by cold winters and numerous coniferous trees, including spruce and pine. The climate varies, featuring cool to warm summers that are not hot, ranging from 15 to 25 degrees Celsius, and is consistently very wet with frequent rainfall and high humidity. Summers are often cool with abundant rain, winters bring significant snowfall and cold temperatures, and some areas experience warm and pleasant summers with plentiful rainfall.
Shelter
The Eurasian wryneck shelters in the trunks of old trees or artificial nesting boxes, utilizing nests as structures built or used for laying eggs and raising young.
Geography
The Eurasian wryneck is found within the Palearctic biogeographical region and occupies several distinct ecosystems, including Celtic broadleaf forests, broadleaf forests of Western Europe, coniferous forests of the Qilian Mountains, Balkan mixed forests, Baltic mixed forests, and coniferous and mixed forests of the Pyrenees.
Feeding
The Eurasian wryneck primarily feeds on ants and their larvae, raiding ant nests and collecting insects from the ground and tree trunks; the species employs an active hunting strategy to obtain food using its long, sticky tongue. Its diet includes ants, insect larvae, spiders, and various insects such as beetles, butterflies, flies, Hymenoptera, bedbugs, Orthoptera, dragonflies, mayflies, and lacewings. The daily food requirement for the wryneck ranges from 10 to 25 grams.
Reproduction
The Eurasian wryneck’s embryo develops for one week and five days. The female lays eggs in a nest cavity, and both parents take turns incubating the clutch and feeding the young. A brood consists of seven to twelve birds. The species occupies a tree hollow for nesting. Parental care includes alternating incubation duties and feeding of chicks. The interval between breeding seasons is one year. Young wrynecks reach maturity from ten months to one year and one month.