Wallcreeper

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Wallcreeper (Tichodroma muraria)

The Wallcreeper, scientifically known as Tichodroma muraria, is a bird species that belongs to the superfamily Certhioidea. A 2016 phylogenetic study suggests that it is a sister species to the Sittidae family. The species was first described by Carl Linnaeus in 1766 and has since been found in southern and eastern Europe, as well as the Caucasus region and western Iran.

The Wallcreeper's distribution range extends from Nepal to Greece, with the species being commonly observed in alpine layers of Eurasia. In terms of physical characteristics, the bird measures approximately 17-19 centimeters (6.7-0.67 inches) in length, weighing between 17-19 grams (0.60-0.67 ounces). The juvenile birds closely resemble the winter feathers and are slightly darker than the nominate race.

One distinctive feature of the Wallcreeper is its vocalizations, which include a song sung by both males and females during the breeding season. However, it's worth noting that the species' singing behavior is largely silent, with females only producing sounds while defending their feeding territories in winter.

Habitat and Distribution

The Wallcreeper inhabits almost all European and Asian mountains, extending eastwards to the Great Hinggan Mountains northwest of Beijing. The species breeds in crevices or caves and feeds on insects collected from these areas or captured in flight. In Europe, breeding occurrences reach heights of approximately 3500 meters, while in Tibet, they exceed 5000 meters.

Interestingly, despite its wide distribution range, the Wallcreeper's systematic classification is still a subject of debate among scientists. The species exhibits characteristics of both the Sittidae and Certhiidae families, making it challenging to evaluate its validity as a distinct family (Tichodromidae). As of 2020, only two weakly differentiated subspecies are recognized.

Appearance

The Wallcreeper's appearance is unmistakable due to its striking coloration and unique movement patterns. The bird features a broad wingspan with red and white markings, a black throat patch in males during the breeding season, and a long, downwardly curved beak. Its ability to move freely on vertical cliffs and points without visible relief makes it one of the few birds that can do so.

Conservation Status

The Wallcreeper's