Willow warbler

Appearance

It is a typical leaf warbler in appearance, 11–12.5 cm long and 7–15 g weight. It is greenish brown above and off-white to yellowish below; the wings are plain greenish-brown with no wingbars.

Juveniles are yellower below than adults. It is very similar to the chiffchaff, but non-singing birds can be distinguished from that species by their paler pinkish-yellow legs, longer paler bill, more elegant shape and longer primary projection.

Naming

Three subspecies are accepted, with a partly clinal reduction in green and yellow plumage tones from west to east, with central birds browner and easternmost birds predominantly greyish:

⤷ "Phylloscopus trochilus trochilus". Breeds Europe except northern Scandinavia, winters west Africa.
⤷ "Phylloscopus trochilus acredula". Breeds northern Scandinavia east to western Siberia, winters central Africa.
⤷ "Phylloscopus trochilus yakutensis". Breeds eastern Siberia, winters eastern and southern Africa.

Status

Willow warblers prefer young, open, scrubby woodland with small trees, including human-altered habitats such as coppice and young plantations up to 10–20 years old.

High amounts of birch, alder and willow, with good lichen amounts, and water features, fields with large amounts of bracken and mosses, and patches of low bramble are preferred, but it will use a wide range of other species, including young or open coniferous forests.

Incorporating woodland ride edge thickets is beneficial, as is15 metre woodland edges of varying structure and height. They prefer damp woodland areas. Thicket forming shrubs like blackthorn provide pockets of habitat. Deer browsing can degrade the required low cover.

The highest population densities are found in Scandinavia, with up to 1,100 pairs per square kilometre, and a total population in Sweden and Finland of 24 million pairs. Lower densities occur further east, with peak densities of 27 pairs per square kilometre in central Siberia. Even lower densities are found on the southern edge of the breeding range, with just 9 pairs per square kilometre in Switzerland, and a total of just 100 pairs in the whole of northern Spain.

In England this species has on average decreased in population by 70% within the last 25 years, with the biggest declines in the southeast. In Scotland some increases have occurred. The Forestry Commission offers grants under a scheme called England's Woodland Improvement Grant; as does Natural Englands Environmental Stewardship Scheme.

Behavior

Its song is a simple repetitive descending whistle, while the contact call is a disyllabic 'hoo-eet', distinct from the more monosyllabic 'hweet' of chiffchaffs.

Migration

All populations are highly migratory, with the subspecies "P. t. yakutensis" migrating up to 12,000 km from eastern Siberia to southern Africa along the Asian - East African Flyway, one of the longest migrations of any for a bird of its size.

Approximate timings are:
⤷ October to March: wintering in sub Saharan Africa.
⤷ Mid March to mid May: migrates and arrives in the breeding range.
⤷ Late April to August: breeding season, usually only one brood but rarely two.
⤷ August to October: migrates back to Africa.

Evolution

The willow warbler was first scientifically described by Linnaeus in his "Systema Naturae" in 1758 under the genus "Motacilla". and then transferred to the genus "Phylloscopus" by Boie in 1826.

Before the English name was standardised to willow warbler by William Yarrell in 1843, it was sometimes called "willow wren".