European robin

European robin
European robin in Lancashire, UK
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Muscicapidae
Genus: Erithacus
Cuvier, 1800
Species: E. rubecula
Binomial name
Erithacus rubecula
(Linnaeus, 1758)
Subspecies

7–10, see text.

Global range     Year-Round Range     Summer Range     Winter Range

The European robin (Erithacus rubecula), known simply as the robin or robin redbreast in the British Isles, is a small insectivorous passerine bird, specifically a chat, that was formerly classified as a member of the thrush family (Turdidae) but is now considered to be an Old World flycatcher. About 12.5–14.0 cm (5.0–5.5 inch) in length, the male and female are similar in colouration, with an orange breast and face lined with grey, brown upperparts and a whitish belly. It is found across Europe, east to Western Siberia and south to North Africa; it is sedentary in most of its range except the far north.

The term robin is also applied to some birds in other families with red or orange breasts. These include the American robin (Turdus migratorius), which is a thrush, and the Australasian robins of the family Petroicidae, the relationships of which are unclear.

Taxonomy and systematics

A robin perching on a fence

The European robin was described by Carl Linnaeus in 1758 in the 10th edition of his Systema Naturae under the binomial name Motacilla rubecula.[2] Its specific epithet rubecula is a diminutive derived from the Latin ruber 'red'.[3][4] The genus Erithacus was introduced by French naturalist Georges Cuvier in 1800, giving the bird its current binomial name E. rubecula.[5][6] The genus name Erithacus is from Ancient Greek[7] and refers to an unknown bird, now usually identified as robin.[8]

The genus previously included the Japanese robin and the Ryukyu robin. These east Asian species were shown in molecular phylogenetic studies to be more similar to a group of other Asian species than to the European robin.[9][10] In a reorganisation of the genera, the Japanese and the Ryukyu robins were moved to the resurrected genus Larvivora leaving the European robin as the sole member of Erithacus.[11] The phylogenetic analysis placed Erithacus in the subfamily Erithacinae, which otherwise contained only African species, but its exact position with respect to the other genera was not resolved.[10]

The distinctive orange breast of both sexes contributed to the European robin's original name of redbreast (orange as the name of a colour was unknown in English until the sixteenth century, by which time the fruit of that name had been introduced). In the fifteenth century, when it became popular to give human names to familiar species, the bird came to be known as robin redbreast, which was eventually shortened to robin.[12] As a given name, Robin was originally a diminutive of Robert. Other older English names for the bird include ruddock and robinet. In American literature of the late 19th century, this robin was frequently called the English robin.[13] Dutch roodborstje and French rouge-gorge both refer to the distinctively coloured front.[14]

The robin belongs to a group of mainly insectivorous birds that have been variously assigned to the thrushes or "flycatchers", depending on how these groups were perceived taxonomically. Eventually, the flycatcher-thrush assemblage was re-analysed and the genus Erithacus assigned to a group of thrush-like true flycatchers, the tribe Saxicolini, that also includes the common nightingale and the Old World chats.[15]

Subspecies

Adult in Toulouse, France.

In its large continental Eurasian range, robins vary somewhat, but do not form discrete populations that might be considered subspecies.[16][17] Robin subspecies are mainly distinguished by forming resident populations on islands and in mountainous areas. The robin found in Ireland, Britain and much of western Europe, Erithacus rubecula melophilus, occurs as a vagrant in adjacent regions. E. r. witherbyi from Northwestern Africa, Corsica, and Sardinia closely resembles melophilus but for a shorter wing length.[18] The northeasternmost birds, large and fairly washed-out in colour are E. r. tataricus. In the southeast of its range, E. r. valens of the Crimean Peninsula, E. r. caucasicus of the Caucasus and N Transcaucasia, and E. r. hyrcanus southeastwards into Iran are generally accepted as significantly distinct.[18]

On Madeira and the Azores, the local population has been described as E. r. microrhynchos, and although not distinct in morphology, its isolation seems to suggests the subspecies is valid (but see below).

Canary Islands robin

Adult and juvenile of the Gran Canaria robin

The most distinct birds are those of Gran Canaria (E. r. marionae) and Tenerife (E. r. superbus), which may be considered two distinct species or at least two different subspecies. It is readily distinguished by a white eye-ring, an intensely coloured breast, and a grey line that separates the orange-red from the brown colouration. Its belly is entirely white.[19]

Cytochrome b sequence data and vocalisations[20] indicate that the Gran Canaria/Tenerife robins are indeed very distinct and probably derived from colonisation by mainland birds some 2 million years ago.[21] In addition, Gran Canaria and Tenerife birds are well distinct genetically between each other.

Christian Dietzen, Hans-Hinrich Witt and Michael Wink published in 2003 in Avian Science a study called "The phylogeographic differentiation of the European robin Erithacus rubecula on the Canary Islands revealed by mitochondrial DNA sequence data and morphometrics: evidence for a new robin taxon on Gran Canaria?".[16] In it they concluded that Gran Canaria's robin diverged genetically from their European relatives as far back as 2.3 million years, while the Tenerife ones took half a million years to make this leap, 1.8 million years ago. The reason would be a different colonization of the Canaries by this bird, which arrived at the oldest island first (Gran Canaria) and subsequently passed to the neighboring island (Tenerife).[22]

A thorough comparison between marionae and superbus is pending to confirm that the first one is effectively a different subspecies. Initial results suggest that birds from Gran Canaria have wings about 10% shorter than those on Tenerife.[16] The west Canary Islands populations are younger (Middle Pleistocene) and only beginning to diverge genetically. Robins from the western Canary Islands: El Hierro, La Palma and La Gomera (E. (r.) microrhynchus) are similar to the European (Erithacus rubecula).[18]

Finally, the robins which can be found in Fuerteventura are the European ones, which is not surprising as the species does not breed either in this island or in the nearby Lanzarote, they are wintering birds or just passing through during their long migrations between Africa and Europe.[22]

Other robins

The larger American robin (Turdus migratorius) is named for its similarity to the European robin, but the two birds are not closely related. The similarity lies largely in the orange chest patch in both species. This American species was incorrectly shown "feathering its nest" in London in the film Mary Poppins,[23] but it only occurs in the UK as a very rare vagrant.[24]

Some South and Middle American Turdus thrushes are also named as robins such as the rufous-collared robin. The Australian "robin redbreast", more correctly the scarlet robin (Petroica multicolor), is more closely related to the crows and jays than it is to the European robin. It belongs to the family Petroicidae, commonly called "Australasian robins". The red-billed leiothrix (Leiothrix lutea) is sometimes named "Pekin robin" by aviculturalists. Another group of Old World Flycatchers, this time from Africa and Asia, is the genus Copsychus; its members are known as magpie-robins, one of which, the Oriental magpie robin (C. saularis), is the national bird of Bangladesh.[25]

Description

Juvenile, Sussex

The adult European robin is 12.5–14.0 cm (5.0–5.5 in) long and weighs 16–22 g (9/16–13/16 oz), with a wingspan of 20–22 cm (8–9 in). The male and female bear similar plumage; an orange breast and face (more strongly coloured in the otherwise similar British subspecies E. r. melophilus), lined by a bluish grey on the sides of the neck and chest. The upperparts are brownish, or olive-tinged in British birds, and the belly whitish, while the legs and feet are brown. The bill and eyes are black. Juveniles are a spotted brown and white in colouration, with patches of orange gradually appearing.[26]

Distribution and habitat

The robin occurs in Eurasia east to Western Siberia, south to Algeria and on the Atlantic islands as far west as the Azores and Madeira. It is a vagrant in Iceland. In the south-east, it reaches the Caucasus range. Irish and British robins are largely resident but a small minority, usually female, migrate to southern Europe during winter, a few as far as Spain. Scandinavian and Russian robins migrate to Britain and western Europe to escape the harsher winters. These migrants can be recognised by the greyer tone of the upper parts of their bodies and duller orange breast. The European robin prefers spruce woods in northern Europe, contrasting with its preference for parks and gardens in Ireland and Britain.[27]

Attempts to introduce the European robin into Australia and New Zealand in the latter part of the 19th century were unsuccessful. Birds were released around Melbourne, Auckland, Christchurch, Wellington and Dunedin by various local acclimatisation societies, with none becoming established. There was a similar outcome in North America as birds failed to establish after being released in Long Island, New York in 1852, Oregon in 1889–1892, and the Saanich Peninsula in British Columbia in 1908–1910.[28]

Behaviour and ecology

Gardener's friend looking out for food on the ground
Feeding from a hand

The robin is diurnal, although has been reported to be active hunting insects on moonlit nights or near artificial light at night.[17] Well known to British and Irish gardeners, it is relatively unafraid of people and drawn to human activities involving the digging of soil, in order to look out for earthworms and other food freshly turned up. Indeed, the robin is considered to be a gardener's friend and for various folklore reasons the robin would never be harmed. In continental Europe on the other hand, robins were hunted and killed as with most other small birds, and are more wary.[26] Robins also approach large wild animals, such as wild boar and other animals which disturb the ground, to look for any food that might be brought to the surface. In autumn and winter, robins will supplement their usual diet of terrestrial invertebrates, such as spiders, worms and insects, with berries and fruit.[27] They will also eat seed mixtures placed on bird-tables.[26]

Male robins are noted for their highly aggressive territorial behaviour. They will attack other males that stray into their territories and have been observed attacking other small birds without apparent provocation. Such attacks sometimes lead to fatalities, accounting for up to 10% of adult robin deaths in some areas.[29]

Because of high mortality in the first year of life, a robin has an average life expectancy of 1.1 years; however, once past its first year it can expect to live longer and one robin has been recorded as reaching 19 years of age.[30] A spell of very low temperatures in winter may also result in significant mortality.[31] This species is parasitised by the moorhen flea, Dasypsyllus gallinulae.[32]

Breeding

Nest with five eggs
A single egg

Robins may choose a wide variety of sites for building a nest. In fact, anything which can offer some shelter, like a depression or hole may be considered. As well as the usual crevices, or sheltered banks, other objects include pieces of machinery, barbecues, bicycle handlebars, bristles on upturned brooms, discarded kettles, watering cans, flower pots and even hats. The nest is composed of moss, leaves and grass, with fine grass, hair and feathers for lining. Two or three clutches of five or six eggs are laid throughout the breeding season, which commences in March in Britain and Ireland. The eggs are a cream, buff or white speckled or blotched with reddish-brown colour, often more heavily so at the larger end.[33] When juvenile birds fly from the nests they are mottled brown in colour all over. After two to three months out of the nest, the juvenile bird grows some orange feathers under its chin and over a similar period this patch gradually extends to complete the adult appearance.

Vocalisations

Singing near Doolin, Ireland

The robin produces a fluting, warbling  song  during the breeding season. Both the male and female sing during the winter, when they hold separate territories, the song then sounding more plaintive than the summer version.[26] The female robin moves a short distance from the summer nesting territory to a nearby area that is more suitable for winter feeding. The male robin keeps the same territory throughout the year. During the breeding season, male robins usually initiate their morning song an hour before civil sunrise, and usually terminate their daily singing around thirty minutes after sunset.[34] Nocturnal singing can also occur, especially in urban areas that are artificially lighted during the night.[34] Under artificial light, nocturnal singing can be used by urban robins to actively shunt daytime anthropogenic noise.[35] A variety of calls is also made at any time of year, including a ticking note indicating anxiety or mild alarm.

Magnetoreception

The avian magnetic compass of the robin has been extensively researched and uses vision-based magnetoreception, in which the robin's ability to sense the magnetic field of the earth for navigation is affected by the light entering the bird's eye. The physical mechanism of the robin's magnetic sense is not fully understood, but may involve quantum entanglement of electron spins.[36]

Cultural depictions

'Redbreast' engraving by Benjamin Fawcett (1853).

The robin features prominently in British folklore, and that of northwestern France, but much less so in other parts of Europe.[37] It was held to be a storm-cloud bird and sacred to Thor, the god of thunder, in Norse mythology.[38] Robins feature in the traditional children's tale, Babes in the Wood; the birds cover the dead bodies of the children.[39]

More recently, the robin has become strongly associated with Christmas, taking a starring role on many Christmas cards since the mid 19th century.[39] The robin has appeared on many Christmas postage stamps. An old British folk tale seeks to explain the robin's distinctive breast. Legend has it that when Jesus was dying on the cross, the robin, then simply brown in colour, flew to his side and sang into his ear in order to comfort him in his pain. The blood from his wounds stained the robin's breast, and thereafter all robins got the mark of Christ's blood upon them.[38][40]

An alternative legend has it that its breast was scorched fetching water for souls in Purgatory.[39] The association with Christmas more probably arises from the fact that postmen in Victorian Britain wore red jackets and were nicknamed "Robins"; the robin featured on the Christmas card is an emblem of the postman delivering the card.[41]

In the 1960s, in a vote publicised by The Times, the robin was adopted as the unofficial national bird of the UK.[42] In 2015, the robin was again voted Britain's national bird in a poll organised by birdwatcher David Lindo, taking 34% of the final vote.[43]

Several English and Welsh sports organisations are nicknamed "the Robins". These include the professional football clubs Bristol City, Crewe Alexandra, Swindon Town, Cheltenham Town (whose home colours are red) and, traditionally, Wrexham FC, as well as the English rugby league team Hull Kingston Rovers (whose home colours are white with a red band).[44] A small bird is an unusual choice, although it is thought to symbolise agility in darting around the field.[45]

References

  1. ↑ BirdLife International (2016). "Erithacus rubecula". IUCN Red List of Threatened Species. IUCN. 2016: e.T22709675A87880390. Retrieved 13 December 2016.
  2. ↑ Linnaeus, Carolus (1758). Systema naturae per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Tomus I. Editio decima, reformata. (in Latin). Holmiae. (Laurentii Salvii). p. 188. M. grisea, gula pectoreque fulvis.
  3. ↑ Simpson, D.P. (1979). Cassell's Latin Dictionary (5th ed.). London, UK: Cassell Ltd. p. 883. ISBN 0-304-52257-0.
  4. ↑ ruber. Charlton T. Lewis and Charles Short. A Latin Dictionary on Perseus Project.
  5. ↑ Mayr, Ernst; Paynter, Raymond A. Jr. (1964). Check-list of Birds of the World. Volume 10. Cambridge, Massachusetts: Museum of Comparative Zoology. p. 32.
  6. ↑ Cuvier, George (1800). Leçons d'anatomie comparée. Volume 1 (in French). L'Institute National des Sciences et des Arts. Table 2. (The year is given on the title page as "VIII" in the French Republican Calendar)
  7. ↑ ἐρίθακος. Liddell, Henry George; Scott, Robert; A Greek–English Lexicon at the Perseus Project.
  8. ↑ Jobling, James A. (2010). The Helm Dictionary of Scientific Bird Names. London, United Kingdom: Christopher Helm. p. 149. ISBN 978-1-4081-2501-4.
  9. ↑ Seki, Shin-Ichi (2006). "The origin of the East Asian Erithacus robin, Erithacus komadori, inferred from cytochrome b sequence data". Molecular Phylogenetics and Evolution. 39 (3): 899–905. PMID 16529957. doi:10.1016/j.ympev.2006.01.028.
  10. 1 2 Sangster, G.; Alström, P.; Forsmark, E.; Olsson, U. (2010). "Multi-locus phylogenetic analysis of Old World chats and flycatchers reveals extensive paraphyly at family, subfamily and genus level (Aves: Muscicapidae)". Molecular Phylogenetics and Evolution. 57 (1): 380–392. PMID 20656044. doi:10.1016/j.ympev.2010.07.008.
  11. ↑ Gill, Frank; Donsker, David, eds. (2016). "Chats, Old World flycatchers". World Bird List Version 6.2. International Ornithologists' Union. Retrieved 20 May 2016.
  12. ↑ Lack, D. (1950). Robin Redbreast. Oxford: Oxford, Clarendon Press. p. 44.
  13. ↑ Sylvester, Charles H. (2006). Journeys Through Bookland. BiblioBazaar, LLC. p. 155. ISBN 1-4264-2117-6.
  14. ↑ Holland, J. (1965). Bird Spotting. London, UK: Blandford. p. 225.
  15. ↑ Monroe Jr. BL; Sibley CG (1993). A World Checklist of Birds. New Haven and London: Yale University Press. p. 228. ISBN 0-300-05549-8.
  16. 1 2 3 Dietzen, Christian; Witt, Hans-Hinrich; Wink, Michael (2003). "The phylogeographic differentiation of the robin Erithacus rubecula on the Canary Islands revealed by mitochondrial DNA sequence data and morphometrics: evidence for a new robin taxon on Gran Canaria?" (PDF). Avian Science. 3 (2–3): 115–131.
  17. 1 2 Pätzold, R. (1995). Das Rotkehlchen Erithacus rubecula. Neue Brehm-Bücherei (in German). Magdeburg/Heidelberg: Westarp Wissenschaften/Spektrum. ISBN 3-89432-423-6.
  18. 1 2 3 Lack, D. (1946). "The Taxonomy of the Robin, Erithacus rubecula (Linnaeus)". Bulletin of the British Ornithologists' Club. 66: 55–64.
  19. ↑ Cramp S, ed. (1988). Handbook of the Birds of Europe, the Middle East and North Africa. The Birds of the Western Palearctic. Volume V. Tyrant Flycatchers to Thrushes. Oxford: Oxford University Press. ISBN 0-19-857508-4.
  20. ↑ Bergmann, H.H.; Schottler, B. (2001). "Tenerife robin Erithacus (rubecula) superbus – a species of its own?". Dutch Birding. 23: 140–146.
  21. ↑ Although Dietzen et al. (2003) conclude that both Tenerife and Gran Canaria populations are independently derived from mainland populations and should constitute two species or all be placed in E. rubecula as subspecies, their data does not allow for a definite conclusion. The alternative explanation – that Tenerife was colonised by already-distinct Gran Canaria robins – has not been explored and the proposed model relies only on probabilistic inference. Likewise, the seemingly exact molecular dating is doubtful as it assumes a molecular clock that may or may not be correct, and of course the assumption that the ancestor of all robins was similar in colouration to superbus and not the continental birds is, being inferred from their model of colonisation, entirely conjectural.
  22. 1 2 César-Javier Palacios, "Hallazgo en Gran Canaria de una especie de petirrojo única en el mundo", Newspaper Canarias 7 (2006); accessed 24 February 2015.
  23. ↑ "Mary Poppins (1964)". IMDb. Retrieved 21 January 2008.
  24. ↑ John Roberts,"Village braced for invasion of twitchers as rare visitor flies in", Yorkshire Post; accessed 24 February 2015.
  25. ↑ "National Icons of Bangladesh". Bangla2000. Retrieved 5 August 2010.
  26. 1 2 3 4 Hume R (2002). RSPB Birds of Britain and Europe. London: Dorling Kindersley. p. 263. ISBN 0-7513-1234-7.
  27. 1 2 Jonsson, Lars (1976). Birds of Wood, Park and Garden. Middlesex, England: Penguin. p. 90. ISBN 0-14-063002-3.
  28. ↑ Long, John L. (1981). Introduced Birds of the World: The worldwide history, distribution and influence of birds introduced to new environments. Terrey Hills, Sydney: Reed. p. 309. ISBN 0-589-50260-3.
  29. ↑ "The RSPB-Robin:Territory". RSPB website. Retrieved 17 May 2008.
  30. ↑ "Euring: European Longevity Records". euring.org. Retrieved 1 June 2015.
  31. ↑ "The RSPB-Robin:Threats". RSPB website. Retrieved 17 May 2008.
  32. ↑ Rothschild, Miriam; Clay, Theresa (1957). Fleas, Flukes and Cuckoos. A study of bird parasites. New York: Macmillan. p. 113.
  33. ↑ Evans, G. (1972). The Observer's Book of Birds' Eggs. London, UK: Warne. p. 85. ISBN 0-7232-0060-2.
  34. 1 2 Da Silva; Samplonius; Schlicht, Valcu; Gaston (2014). "Artificial night lighting rather than traffic noise affects the daily timing of dawn and dusk singing in common European songbirds". Behavioral Ecology. 25 (5): 1037–1047. doi:10.1093/beheco/aru103.
  35. ↑ Fuller RA, Warren PH, Gaston KJ (2007). "Daytime noise predicts nocturnal singing in urban robins". Biology Letters. 3 (4): 368–70. PMC 2390663 Freely accessible. PMID 17456449. doi:10.1098/rsbl.2007.0134.
  36. ↑ "Cryptochrome and Magnetic Sensing". Theoretical and Computational Biophysics Group. Retrieved 24 February 2015.
  37. ↑ Ingersoll, p. 167
  38. 1 2 Cooper, JC (1992). Symbolic and Mythological Animals. London, UK: Aquarian Press. p. 194. ISBN 1-85538-118-4.
  39. 1 2 3 de Vries, Ad (1976). Dictionary of Symbols and Imagery. Amsterdam: North-Holland Publishing Company. pp. 388–89. ISBN 0-7204-8021-3.
  40. ↑ Goodall, Simon. "European robin (Erithacus rubecula)". Greater Manchester Local Record Centre. Retrieved 24 February 2015. In Christian folklore the robin got its red breast because it plucked a thorn from Jesus' crown-of-thorns during His crucifixion. A drop of Jesus' blood fell on to the bird and thereafter they had a red breast – for Christians the robin has long been associated with charity and piety.
  41. ↑ "Robin". BBC. Archived from the original on 29 December 2002. Retrieved 3 January 2008.
  42. ↑ "Robin". BBC. Retrieved 24 September 2010.
  43. ↑ "Robin wins vote for UK's national bird". The Guardian. London. 10 June 2015. Retrieved 13 June 2016.
  44. ↑ Hull Kingston Rovers RLFC. "Hull Kingston Rovers: History". Official Website. Hull Kingston Rovers RLFC. Retrieved 22 February 2012.
  45. ↑ Morris, Desmond (1981). The Soccer Tribe. London, UK: Jonathan Cape. p. 210. ISBN 0-224-01935-X.

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