Dunnock

Prunella modularis

TAXONOMY

Prunella modularis Linnaeus, 1758. OTHER COMMON NAMES

English: Hedge-sparrow, hedge accentor; French: Accenteur mouchet; German: Heckenbrounelle; Spanish: Acentor Común.

PHYSICAL CHARACTERISTICS

6 in (15 cm); 0.7 oz (19 g). The beak is pointed and slender, and the feet and legs are sturdy. Upperparts are brownish gray and usually streaked with black and lighter colors; underparts are more uniformly gray with a few apricot markings.

DISTRIBUTION

The dunnock occurs in suitable habitat throughout Europe, ranging as far east as the far western regions of Russia. It is migratory in northern parts of its range, but may be resident in more southern parts in France and Spain. The dunnock was introduced to New Zealand between 1860 and 1880, where it persists today.

HABITAT

Dunnocks occur in woods with abundant undergrowth, and in hedges and shrubbery near forest edges, typically at a breeding density of less than about 2.6 pairs per m2 (1 pair per km2). In well-vegetated farmland and gardens of midland Britain, however, their density can be up to 30 times greater.

BEHAVIOR

Dunnocks are shy and unassuming birds. In many areas, they are characteristic but little-known garden birds because of their secretive habits. Most populations are migratory. Dunnocks are normally seen as individuals or pairs during the breeding season, but during winter they may occur in large foraging flocks. A particularly good local food source may encourage a flock of a hundred or more birds to gather. Dunnocks sing from the

tops of conifers of medium height. The song is a short, bright, soft, metallic twittering.

FEEDING ECOLOGY AND DIET

During the growing season, dunnocks predominantly feed on invertebrates, including insects, spiders, and worms. During the winter they eat seeds and small berries. They will readily consume food put out for songbirds at winter feeders.

REPRODUCTIVE BIOLOGY

Dunnocks build a cup-shaped nest in a shrub or low tree. They breed from about the beginning of April to the end of July, and typically raise two broods per year. The incubation period is 12-14 days, and the young are fully fledged at 11-13 days after hatching. Both parents care for their young. Dunnocks are often polyandrous breeders, that is, a female will mate with several males within her breeding territory, and all may cooperate to raise the young.

CONSERVATION STATUS

Not threatened. The dunnock is a widespread and relatively abundant bird. In some parts of their range, however, they have significantly decreased in abundance. In Britain, for example, the species has declined by 45-60% between 1975 and 2001. The most precipitous population decline was during 1975 through 1986, with maintenance of the lower population thereafter. The reasons for the decline are not known, and it did not occur throughout the British Isles (Wales had a population increase).

SIGNIFICANCE TO HUMANS

Dunnocks are of no direct significance to people, except for the economic benefits of bird-watching. Ticks living on dunnocks and other migratory birds have been recently (2001) implicated in the spread of a bacterial pathogen, Ehrlichia phagocytophila, the causative agent of the rare disease ehrlichiosis in humans. The dunnock is mentioned by the English novelist, Emily Bronte, in her famous novel, Wuthering Heights. ♦

Was this article helpful?

0 0

Post a comment