Yellow Wagtail

Yellow Wagtail

Motacilla flava
Yellow Wagtail, Paul Hillion

Introduction

The Yellow Wagtail is a summer visitor, breeding primarily in southern and eastern Britain.

This is a strongly migratory species, wintering in trans-Saharan Africa and returning from early April to breed in grassy habitats, particularly in proximity to cattle. There has been a major decline in numbers since the 1970s, albeit with more stability over the last decade. The decline appears strongly linked to agricultural intensification.

Along with the decline in numbers, the Yellow Wagtail has also undergone range contraction. Most of our breeding birds are now found in central and northern England. It is extinct as a breeding bird on the island of Ireland, where is now only found while on passage.

  • Our Trends Explorer gives you the latest insight into how this species' population is changing.
Yellow Wagtail, Paul Hillion

Key Stats

Status
Common
Common
Weight
Weight
17.6g
Eggs
Eggs
5-6
BTO Records
BTO Records
180k records
Population and distribution stats for:
Population Change
Population Change
78% decrease 1967 to 2023
Population Size
Population Size
20k territories
Distribution Change
Distribution_change
-32.3% contraction
Population Size
Population Size
No current data
Distribution Change
Distribution_change
-85.7% contraction

Identification

Curated resources to aid in the identification of Yellow Wagtail

ID Videos

This section features BTO training videos headlining this species, or featuring it as a potential confusion species.

Yellow-coloured wagtails

Songs and Calls

Listen to example recordings of the main vocalisations of Yellow Wagtail, provided by xeno-canto contributors.

Song:

Call:

Flight call:

Movement

Information about Yellow Wagtail movements and migration based on online bird portals (e.g. BirdTrack), Ringing schemes and tracking studies.

Britain & Ireland movement

View a summary of recoveries in the Online Ringing Report

Foreign locations of birds ringed or recovered in Britain & Ireland

Dots show the foreign destinations of birds ringed in Britain & Ireland, and the origins of birds ringed overseas that were subsequently recaptured, resighted or found dead in Britain & Ireland. Dot colours indicate the time of year that the species was present at the location.

  • Winter (Nov-Feb)
  • Spring (Mar-Apr)
  • Summer (May-Jul)
  • Autumn (Aug-Oct)
Foreign locations of birds ringed or recovered in Britain & Ireland

European movements

EuroBirdPortal uses birdwatcher's records, such as those logged in BirdTrack to map the flows of birds as they arrive and depart Europe. See maps for this species here.

The Eurasian-African Migration Atlas shows movements of individual birds ringed or recovered in Europe. See maps for this species here.

Biology

Lifecycle and body size information for Yellow Wagtail, including statistics on nesting, eggs and lifespan based on BTO ringing and nest recording data.

Productivity and Nesting

Nesting timing

Average (range) fo first clutch laying dates
24 May (7 May-3 Jul)
Typical (exceptional) number of broods
1–2

Egg measurements

Typical length x width
18x14 mm
Mass (% shell)
1.8g (6%)

Clutch Size

Typical number
5-6 eggs
Average ±1 standard deviation
5.24±0.88 eggs
Observed minimum and maximum
3-7 eggs

Incubation

Incubation by
Female
Typical duration
14 days
Observed average ±1 standard deviation
13.59±1.27 days
Observed minimum and maximum
11-16.5 days

Fledging

Type of chick
Altricial, downy
Typical duration
13-15 days
Observed average ±1 standard deviation
13.94±1.21 days
Minimum and maximum
12-15.5 days
N=425, -Source
Visit our Trends Explorer for trend graphs and country statistics.

Survival and Longevity

Survival is shown as the proportion of birds surviving from one year to the next and is derived from bird ringing data. It can also be used to estimate how long birds typically live.

View number ringed each year in the Online Ringing Report.

Lifespan

Typical life expectancy of bird reaching breeding age
3 years with breeding typically at 1 year
Maximum age from a ringed bird
7 years, 1 month, 14 days (set in 1982)

Survival of adults

All adults
0.533±0.031

Survival of juveniles

All juveniles
0.463±0.041 (in first year)
Visit our Trends Explorer for trend graphs and country statistics.

Biometrics

Wing length and body weights are from live birds (source).

Wing length

Average ±1 std deviation; range and sample size in brackets.
Juvenile
81.2±2.6 mm
(77-85 mm, N=999)
All adults
81.6±3 mm
(76-86 mm, N=295)
Female
79.3±2.8 mm
(75-84 mm, N=82)
Male
82.8±2.5 mm
(79-86 mm, N=176)

Body weight

Average ±1 std deviation; 5th and 95th percentiles and sample size in brackets.
Juvenile
17.9±1.7 g
(15.5-21 g, N=869)
All adults
17.6±1.7 g
(15.3-20.4 g, N=270)
Female
16.9±1.8 g
(15-21.3 g, N=77)
Male
17.7±1.5 g
(15.5-19.9 g, N=159)
Visit our Trends Explorer for trend graphs and country statistics.

Ring Size

A

Classification, names and codes

Taxonomy, names and species codes for Yellow Wagtail

Classification and Codes

  • Order: Passeriformes
  • Family: Motacillidae
  • Scientific name: Motacilla flava
  • Authority: Linnaeus, 1758
  • BTO 2-letter code: YW
  • BTO 5-letter code: YELWA
  • Euring code number: 10170

Alternate species names

  • Catalan: cuereta groga
  • Czech: konipas lucní
  • Danish: Gul Vipstjert
  • Dutch: Gele Kwikstaart
  • Estonian: hänilane
  • Finnish: keltavästäräkki
  • French: Bergeronnette printanière
  • Gaelic: Breacan-buidhe
  • German: Schafstelze
  • Hungarian: sárga billegeto
  • Icelandic: Gulerla
  • Irish: Glasóg Bhuí
  • Italian: Cutrettola
  • Latvian: dzeltena cielava
  • Lithuanian: geltonoji kiele
  • Norwegian: Gulerle
  • Polish: pliszka zólta
  • Portuguese: alvéola-amarela
  • Slovak: trasochvost žltý
  • Slovenian: rumena pastirica
  • Spanish: Lavandera boyera
  • Swedish: gulärla
  • Welsh: Siglen Felen

Research

Interpretation and scientific publications about Yellow Wagtail from BTO scientists.

Causes of Change and Solutions

Causes of change

Agricultural intensification is the ultimate cause of population declines. However, the mechanisms underlying the decline remain unclear.

Further information on causes of change

Changes in agricultural practices have been proposed as the main reason for declines via their impact on the quality of foraging and breeding habitats. The magnitude of Yellow Wagtail decline appears to vary between habitats, being strongest in wet grassland and marginal upland areas (Henderson et al. 2004, Wilson & Vickery 2005). Chamberlain & Fuller (2000, 2001) found that there were greater range contractions in regions dominated by pastoral agriculture. The decline in pastoral habitats has been proposed to be due to agricultural intensification, specifically farmland drainage, the conversion of pasture to arable land, changes in grazing and cutting regimes, the loss of insects associated with cattle and changes to grassland ecosystems in marginal upland areas (Gibbons et al. 1993, Chamberlain & Fuller 2000, 2001, Flyckt 1999, Vickery et al. 2001, Nelson et al. 2003, Bradbury & Bradter 2004, Henderson et al. 2004). Such changes are likely to have reduced the quality of grasslands as a nesting and foraging habitat.

Data from eastern England suggest a strong avoidance of grassland and preference for spring-sown crops (Mason & Macdonald 2000), though breeding can also be successful in landscapes dominated by winter cereals (Kirby et al. 2012). A detailed autecological study by Gilroy et al. (2008) provides good evidence that, on arable land, soil penetrability had a significant influence on the abundance of Yellow Wagtails, together with crop type and soil type, as these influenced invertebrate capture rates. There was a strong relationship between Yellow Wagtails and soil penetrability, suggesting a potential causative link between soil degradation and population decline (Gilroy et al. 2008). Breeding-season length may also be limited in cereal-dominated areas, as Yellow Wagtails avoid autumn-sown cereals late in the season (Gilroy et al. 2009, 2010). Predation was also considered and it was found that predation rate was closer nearer to tramlines and field-edges (Morris & Gilroy 2008). It is uncertain how important nest predation in tramlines is as a limiting factor for Yellow Wagtail populations but no studies have reported predation as a major driver of population decline for this species. Work carried out by Benton et al. (2002) showed that, in Scotland, arthropod abundance was significantly related to agricultural change and that this was also linked to measures of farmland bird density. Although Yellow Wagtail does not breed on Scottish farmland, it is an obligate insectivore, so this evidence adds support to the hypothesis that reduced food availability due to agricultural change may have contributed to the declines in this species.

Yellow Wagtails are long-distance migrants, moving to wintering grounds in western Africa south of the Sahara. Factors relating to conditions on the wintering grounds may also play a role (Bradbury & Bradter 2004, Heldbjerg & Fox 2008, Stevens et al. 2010) but evidence for this is lacking.

Information about conservation actions

The decline of the Yellow Wagtail since the 1980s is believed to be driven by agricultural intensification and resultant habitat changes, although the exact mechanism behind the decline is unclear and therefore specific evidence-based conservation actions to reverse the decline are limited. However, there is good knowledge about breeding habitat preferences.

The research suggests that changes to cattle farming and associated grassland may have reduced quality and food availability; hence actions which enable low intensity pastoral farming may benefit Yellow Wagtails, including a reduction in the use of fertilisers, herbicides and pesticides to provide more diverse semi-natural grasslands. A detailed study of Yellow Wagtail breeding ecology by Bradbury and Bradter (2004) provided good evidence of the species' breeding requirements on grassland. Territories were associated with a greater proportion of bare earth in the sward, the presence of shallow-edged ponds or wet ditches in the field, and a greater probability of a prolonged winter/spring flood, although the relative importance of these and how they impact on demographic processes was indecipherable.

Where Yellow Wagtails nest in arable fields, providing spring sown crops may help improve breeding productivity by extending the breeding season (Mason & McDonald 2000). Alternatively, providing a mosaic of crops may enable Yellow Wagtails to raise early broods in autumn sown cereal fields but switch to other crops (e.g. potatoes) for later broods (Gilroy et al. 2010).

Publications (1)

Birds of Conservation Concern Wales 4: the population status of birds in Wales

Author: Johnstone, I.G., Hughes, J., Balmer, D.E., Brenchley, A., Facey, R.J., Lindley, P.J., Noble, D.G. & Taylor, R.C.

Published: 2022

The latest review of the conservation status of birds in Wales. The report assessed all 220 bird species which regularly occur in Wales. There are now 60 species of bird on the Red List, with 91 on the Amber List and just 69 - less than a third of the total number of species - on the Green List. The latest review of the conservation status of birds in Wales comes 20 years after the first, when the Red List was less than half the length it is today. The report assessed all 220 bird species which regularly occur in Wales. There are now 60 species of bird on the Red List in Wales, with 91 on the Amber List and 69 on the Green List. The Birds of Conservation Concern in Wales report assesses the status of each species against a set of objective criteria. Data sources include the BTO/JNCC/RSPB Breeding Bird Survey and the BTO/RSPB/JNCC Wetland Bird Survey, as well as Bird Atlases and other BTO-led monitoring schemes and citizen science initiatives. These are used to quantify the changing status of the species’ Welsh population. The UK, European and global conservation status of the species is also considered, placing the Welsh population into a wider context. The Red ListSwift, Greenfinch and Rook – familiar breeding species in steep decline across the UK – are among the new additions to the Welsh Red List, which now also includes Purple Sandpiper, on account of a rapidly shrinking Welsh wintering population, and Leach’s Petrel, an enigmatic seabird in decline across its global range. These species now sit alongside well-known conservation priorities, such as Curlew, Hen Harrier and Turtle Dove as birds at risk of being lost from Wales for good. Uplands and woodlands Many of the species on the Red List are found in upland and farmland habitats. Starling, Tree Sparrow, Yellow Wagtail and Yellowhammer can no longer be found in much of Wales, while iconic species of mountain and moorland, such as Ring Ouzel, Merlin and Black Grouse, remain in serious trouble. Wales is well known for its populations of woodland birds; however, many of these – including Lesser Spotted Woodpecker, Willow Warbler and Spotted Flycatcher – also feature on the Red List. Goldcrest, which has seen its Welsh population shrink alarmingly in recent decades, is another new addition. On the coast The assessment for Birds of Conservation Concern Wales 4 took place before the impacts of avian influenza could be taken into account. Breeding seabird species have been struggling in Wales for many years, however, and most were already of conservation concern before the outbreak of this disease. Kittiwake, Puffin, Black-headed Gull, and Common, Arctic and Sandwich Tern remain on the Red List. Wales holds internationally significant numbers of breeding seabirds, making the decline of these colonies a global concern. The Amber ListDeclines in Wheatear, Garden Warbler and House Martin - all migrants which breed in Europe and winter in sub-Saharan Africa - mean these species have moved from the Green List to the Amber List. Many other ‘Afro-Palearctic' migrant species are also in decline, but the potential reasons for this, such as habitat loss and reduced availability of invertebrate prey, are not well understood. Closer to home, the declines in the Welsh Chaffinch population, linked to the disease trichomonosis, have seen the species Amber-listed. A number of other species have been placed on the Amber List because of the wider importance of their Welsh populations, which in each case make up more than half the UK total. Wales is home to more than three-quarters of the UK’s Choughs, for example, so recent declines are cause for concern. The nation’s breeding populations of Manx Shearwater, Pied Flycatcher, Goshawk and Hawfinch also account for more than half the UK total, as does its wintering population of Spotted Redshank. It’s not all bad news, though: some species now on the Amber List have moved up from the Red List, indicating some positive change in their population trends. These include Common Sandpiper, Great Black-backed Gull, Bullfinch, Goldcrest and Pied Flycatcher. The Green ListWhile the report contains much cause for alarm, several conservation success stories shine through. Red Kite was almost lost as a British bird during the first half of the 20th century, when only a handful of pairs remained in remote Welsh valleys. Since then, a sustained conservation effort has brought the species back from the brink. Wales is now home to more than 2,500 pairs of Red Kite and the species has now been moved to the Green List, reflecting this incredible change in fortunes. Song Thrush, Reed Bunting, Long-tailed Tit, Redwing and Kingfisher are among the other species to have gone Green, providing much-needed hope that things can go up as well as down.

06.12.22

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