Western Yellow Wagtail

The Western Yellow Wagtail is a slim, brightly coloured wagtail with olive-green upperparts and vivid yellow underparts, noticeably shorter-tailed than its relative, the Grey Wagtail. Head pattern varies considerably across the many geographic forms of this species, ranging from blue-grey headed birds to black-headed and white-headed forms across its wide range, though breeding males across most forms share the same bright yellow underparts.

Females and non-breeding birds are duller, with more olive tones and less vivid yellow, but retain the characteristic short-tailed, ground-loving jizz shared by the species.

It is a classic bird of open farmland, often seen running actively around the feet of grazing cattle and horses, snapping up insects disturbed by the animals' movement.

Key field marks

• Olive-green upperparts and bright yellow underparts
• Shorter tail relative to body size than Grey Wagtail
• Head colour variable by subspecies/form (blue-grey, yellow, or black depending on population)
• Slim build with a habit of running quickly across open ground
• Frequently associates with grazing livestock

Similar species

• Grey Wagtail: longer tail, blue-grey (not olive-green) back, and typically found along fast-flowing streams rather than wet grassland or farmland.
• White/Pied Wagtail: black, white, and grey plumage without any yellow, and a longer tail relative to body size.
• Various Yellow Wagtail subspecies/forms can differ subtly in head pattern, requiring careful attention to head colour and range for form-level identification.

Western Yellow Wagtails breed across much of Europe and western Asia, favouring wet grassland, damp meadows, farmland, and marshes, particularly areas grazed by livestock, which stir up insects that the wagtails readily exploit.

They are long-distance migrants, wintering in sub-Saharan Africa, and the species has declined in parts of western Europe linked to agricultural intensification and loss of damp, insect-rich grassland habitat.

During migration, Yellow Wagtails can occur in a wide range of open habitats, including coastal areas and stubble fields, sometimes forming loose flocks.

Voice

The call is a distinctive, sharp, upslurred "tswee-eep" or "tsleep," frequently given in flight. The song is a simple, brief extension of the call notes, not especially elaborate.

Feeding

Western Yellow Wagtails feed almost entirely on insects, caught by quick pursuit across open ground, and are notably drawn to the feet of grazing cattle, horses, and sometimes farm machinery, which disturb insects from grass and soil.

Nesting and breeding

The nest is a cup of grass built on the ground, well hidden among grass or crop vegetation in wet meadows or farmland. Clutches typically contain four to six eggs.