Ring Ouzel

Ring Ouzel

Turdus torquatus
Ring Ouzel, John Proudlock

Introduction

This striking Thrush, a little larger than a Blackbird, is a bird of our uplands, breeding from Dartmoor to the Scottish mountains.

The white bib of the male and creamy bib of the female combined with a silvery wing panel set this thrush apart from all others. It is also the only thrush that visits Britain & Ireland just for the summer months, arriving in mid-March and departing during September and October, spending the winter as far south as North Africa. In recent years a handful of birds have been found in the UK during the winter, mostly in gardens.

Ring Ouzel has been on the UK Red List since 2002 due to long-term declines in breeding population and range.

  • Our Trends Explorer gives you the latest insight into how this species' population is changing.
Ring Ouzel, John Proudlock

Key Stats

Status
Scarce
Scarce
Weight
Weight
106.1g
BTO Records
BTO Records
72k records
Population and distribution stats for:
Population Change
Population Change
Stable 1995 to 2023
Population Size
Population Size
7,300 pairs
Distribution Change
Distribution_change
-42.9% contraction

Identification

Curated resources to aid in the identification of Ring Ouzel

ID Videos

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

Ring Ouzel and Blackbird

Songs and Calls

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

Song:

Alarm call:

Flight call:

Movement

Information about Ring Ouzel 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 Ring Ouzel, 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
4 May (19 Apr-8 Jun)
Typical (exceptional) number of broods
1–2

Egg measurements

Typical length x width
30x22 mm
Mass (% shell)
7.4g (6%)

Clutch Size

Typical number
4 eggs
Average ±1 standard deviation
4±0.51 eggs
Observed minimum and maximum
2-6 eggs

Incubation

Incubation by
Male + Female
Typical duration
13 days
Observed average ±1 standard deviation
13.18±0.57 days
Observed minimum and maximum
12.5-14.5 days

Fledging

Type of chick
Altricial, downy
Typical duration
13.5-14 days
Observed average ±1 standard deviation
13.71±0.57 days
Minimum and maximum
12.5-14.5 days
N=738, -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
2 years with breeding typically at 1 year
Maximum age from a ringed bird
9 years, 13 days (set in 2017)

Survival of adults

All adults
0.42±0.01
Females
0.37±0.02
Males
0.47±0.02

Survival of juveniles

All juveniles
0.36±0.04 (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
142.9±3.7 mm
(137-148 mm, N=163)
All adults
143.5±3.6 mm
(138-150 mm, N=139)
Female
141.2±2.8 mm
(136-146 mm, N=62)
Male
145.3±3.1 mm
(140-151 mm, N=75)

Body weight

Average ±1 std deviation; 5th and 95th percentiles and sample size in brackets.
Juvenile
104.2±9.8 g
(89-123 g, N=148)
All adults
106.1±11.6 g
(91-128 g, N=127)
Female
104.8±10.7 g
(91-126 g, N=59)
Male
107±12.3 g
(90-129 g, N=66)
Visit our Trends Explorer for trend graphs and country statistics.

Ring Size

C

Classification, names and codes

Taxonomy, names and species codes for Ring Ouzel

Classification and Codes

  • Order: Passeriformes
  • Family: Turdidae
  • Scientific name: Turdus torquatus
  • Authority: Linnaeus, 1758
  • BTO 2-letter code: RZ
  • BTO 5-letter code: RINOU
  • Euring code number: 11860

Alternate species names

  • Catalan: merla de pit blanc
  • Czech: kos horský
  • Danish: Ringdrossel
  • Dutch: Beflijster
  • Estonian: kaelusrästas
  • Finnish: sepelrastas
  • French: Merle à plastron
  • Gaelic: Lòn-monaidh
  • German: Ringdrossel
  • Hungarian: örvös rigó
  • Icelandic: Mánaþröstur
  • Irish: Lon Creige
  • Italian: Merlo dal collare
  • Latvian: apkakles strazds
  • Lithuanian: baltagurklis strazdas
  • Norwegian: Ringtrost
  • Polish: drozd obrozny
  • Portuguese: melro-de-colar
  • Slovak: drozd kolohrivec
  • Slovenian: komatar
  • Spanish: Mirlo capiblanco
  • Swedish: ringtrast
  • Welsh: Mwyalchen y Mynydd

Research

Interpretation and scientific publications about Ring Ouzel from BTO scientists.

Causes of Change and Solutions

Causes of change

There is little evidence explaining either the demographic or ecological drivers of the decline in this species, although low survival between breeding seasons has been identified as a major cause of national decline.

Further information on causes of change

Long-term surveys coordinated by the Ring Ouzel Study Group confirm that declines have occurred throughout the British range (Sim et al. 2010).

British & Irish bird observatory data show a decline in spring passage Ring Ouzels at western locations during 1970-98 that matches the estimated UK breeding decline, but no decline at eastern observatories where most birds are of Fennoscandian origin (Burfield & Brooke 2005). These authors infer that, since these populations winter together, the reasons for decline among UK breeders must lie on the breeding grounds or on passage: they also point out that UK birds are more exposed to hunting pressures, particularly in southwest France.

It has proved difficult to establish any reasons for decline that are linked to the breeding grounds (Buchanan et al. 2003). In southeast Scotland, however, the breeding sites that are still occupied tend to be those at higher altitude and that have retained extensive cover of heather (Sim et al. 2007b). In the same study, it was shown that declines were greatest in years following warm summers on the breeding grounds and also greater two years after high spring rainfall in Morocco: these results suggest that the population decline could be linked to reduced food supplies, and consequently higher rates of natural mortality, in autumn and winter (Beale et al. 2006). Large areas of apparently suitable juniper scrub, with abundant berries but no wintering Ring Ouzels, exist in the Atlas Mountains, however (Green et al. 2012).

Low survival between breeding seasons is apparently a major national cause of decline (Sim et al. 2010). Within Glen Clunie, however, Sim et al. (2011) found that varying combinations of demographic factors produced each year-to-year decline, with reduced early-season productivity, rates of re-nesting and first-year survival all playing a part. A two-year experimental study found that the provision of supplementary food during the breeding season did not have an effect on reproductive success or post-fledging survival suggesting that invertebrate food availability was not a problem at this site, although the authors caution that the study area has intensive predator control so the results may only be directly relevant in similar areas (Sim et al. 2015).

Information about conservation actions

The main cause of the decline may be related to low survival between breeding seasons, and the research has not identified any clear causes of decline that are linked to the breeding grounds. Therefore, the options for taking immediate conservation action to benefit Ring Ouzels in Britain appear limited.

However, low post-fledging survival is one of the possible causes of decline which could occur on the breeding grounds. Variation in chick condition was smaller in territories with better habitat (greater grass and sedge cover and less bracken) (Davies et al. 2014); hence increased grass cover may help ensure a greater proportion of chicks are in good condition to survive immediately after fledging. Juveniles forage on invertebrates in grassland during June to mid-July, but then switch to feed mostly on berries on heather moorland until early September, so a wider variety of habitats may be needed later in the summer to support fledged young prior to migration (Sim 2012).

Publications (2)

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

Reports Birds of Conservation Concern

View a summary report

Nesting dates of Moorland Birds in the English, Welsh and Scottish Uplands

Author: Wilson, M.W., Fletcher, K., Ludwig, S.C. & Leech, D.I.

Published: 2022

Rotational burning of vegetation is a common form of land management in UK upland habitats, and is restricted to the colder half of the year, with the time period during which burning may be carried out in upland areas varying between countries. In England and Scotland, this period runs from the 1st October to 15th April, but in the latter jurisdiction, permission can be granted to extend the burning season to 30th April. In Wales, this period runs from 1st October to 31st March. This report sets out timing of breeding information for upland birds in England, Scotland and Wales, to assess whether rotational burning poses a threat to populations of these species, and the extent to which any such threat varies in space and time.

17.02.22

BTO Research Reports

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