Common cuckoo

Common cuckoo
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Cuculiformes
Family: Cuculidae
Genus: Cuculus
Species: C. canorus
Binomial name
Cuculus canorus
Linnaeus, 1758

The common cuckoo (Cuculus canorus) is a member of the cuckoo order of birds, Cuculiformes, which includes the roadrunners, the anis and the coucals.

This species is a widespread summer migrant to Europe and Asia, and winters in Africa. It is a brood parasite, which means it lays eggs in the nests of other bird species, particularly of dunnocks, meadow pipits, and reed warblers. Although its eggs are larger than those of its hosts, the eggs in each type of host nest resemble the host's eggs. The adult too is a mimic, in its case of the sparrowhawk; since that species is a predator, the mimicry gives the female time to lay her eggs without being seen to do so.

Taxonomy

The species' binomial name is derived from the Latin cuculus (the cuckoo) and canorus (melodious; from canere, meaning to sing).[2] The cuckoo family gets its common name and genus name by onomatopoeia for the call of the male common cuckoo.[3] The English word "cuckoo" comes from the Old French cucu and it first appears about 1240 in the poem Sumer Is Icumen In - "Summer has come in / Loudly sing, Cuckoo!" in modern English.[4]

The scientific name is from Latin. Cuculus is "cuckoo" and canorus, "melodious ".[5]

There are four subspecies worldwide:[6]

Lifespan and demography

Although the common cuckoo's global population appears to be declining, it is classified of being of Least Concern by the International Union for Conservation of Nature. It is estimated that the species numbers between 25 million and 100 million individuals worldwide, with around 12.6 million to 25.8 million of those birds breeding in Europe.[1] The maximum recorded lifespan of a common cuckoo in the United Kingdom is 6 years, 11 months and 2 days.[2]

Description

Common cuckoo in flight

The common cuckoo is 32–34 centimetres (13–13 in) long from bill to tail (with a tail of 13–15 centimetres (5.1–5.9 in) and a wingspan of 55–60 centimetres (22–24 in).[3] The legs are short.[7] It is greyish with a slender body and long tail and can be mistaken for a falcon in flight, where the wingbeats are regular. During the breeding season, common cuckoos often settle on an open perch with drooped wings and raised tail.[7] There is a rufous colour morph, which occurs occasionally in adult females but more often in juveniles.[3]

An Eurasian Cuckoo (C.c.bakeri) from Pangolakha Wildlife Sanctuary in East Sikkim, India.

All adult males are slate-grey; the grey throat extends well down the bird's breast with a sharp demarcation to the barred underparts.[8] The iris, orbital ring, the base of the bill and feet are yellow.[7] Grey adult females have a pinkish-buff or buff background to the barring and neck sides, and sometimes small rufous spots on the median and greater coverts and the outer webs of the secondary feathers.[8]

Rufous morph adult females have reddish-brown upperparts with dark grey or black bars. The black upperpart bars are narrower than the rufous bars, as opposed to rufous juvenile birds, where the black bars are broader.[8]

Common cuckoos in their first autumn have variable plumage. Some are have strongly-barred chestnut-brown upperparts, while others are plain grey. Rufous-brown birds have heavily-barred upperparts with some feathers edged with creamy-white. All have whitish edges to the upper wing-coverts and primaries. The secondaries and greater coverts have chestnut bars or spots. In spring, birds hatched in the previous year may retain some barred secondaries and wing-coverts.[8] The most obvious identification features of juvenile common cuckoos are the white nape patch and white feather fringes.[7]

Common cuckoos moult twice a year: a partial moult in summer and a complete moult in winter.[8] Males weigh around 130 grams (4.6 oz) and females 110 grams (3.9 oz).[2] The common cuckoo looks very similar to the Oriental cuckoo, which is slightly shorter-winged on average.[8]

Mimicry in adult

Photo of sparrowhawk and cuckoo, looking similar
Cuckoo adult (top) mimics sparrowhawk, giving female time to lay eggs parasitically

A study using stuffed bird models found that small birds are less likely to approach common cuckoos that have barred underparts similar to the Eurasian sparrowhawk, a predatory bird. Eurasian reed warblers were found more aggressive to cuckoos that looked less hawk-like, meaning that the resemblance to the hawk helps the cuckoo to access the nests of potential hosts.[9] Other small birds, great tits and blue tits, showed alarm and avoided attending feeders on seeing either (mounted) sparrowhawks or cuckoos; this implies that the cuckoo's hawklike appearance functions as protective mimicry, whether to reduce attacks by hawks or to make brood parasitism easier.[10]

Hosts attack cuckoos more when they see neighbors mobbing cuckoos.[11] The existence of the two plumage morphs in females may be due to frequency-dependent selection if this learning applies only to the morph hosts see neighbors mob. In an experiment with dummy cuckoos of each morph and a sparrowhawk, reed warblers were more likely to attack both cuckoo morphs than the sparrowhawk, and even more likely to mob a certain cuckoo morph when they saw neighbors mobbing that morph, decreasing the reproductive success of that morph and selecting for the less common morph.[11]

Voice

Common cuckoo song, Kaluga region, Russia

The male's song, goo-ko, is usually given from an open perch. During the breeding season the male typically gives this vocalisation with intervals of 1–1.5 seconds, in groups of 10–20 with a rest of a few seconds between groups. The female has a loud bubbling call.[3] The song starts as a descending minor third early in the year in April, and the interval gets wider, through a major third to a fourth as the season progresses, and in June the cuckoo "forgets its tune" and may make other calls such as ascending intervals. Also the cuckoo seems to have a form of absolute pitch as it tends to sing in the key of C.[12] The wings are drooped when calling intensely and when in the vicinity of a potential female, the male often wags its tail from side to side or the body may pivot from side to side.[13]

Distribution and habitat

Essentially a bird of open land, the common cuckoo is a widespread summer migrant to Europe and Asia, and winters in Africa. Birds arrive in Europe in April and leave in September.[7]

The common cuckoo has also occurred as a vagrant in countries including Barbados, the United States, Greenland, the Faroe Islands, Iceland, Indonesia, Palau, Seychelles, Taiwan and China.[1]

Behaviour

Food and feeding

The common cuckoo's diet consists of insects, with hairy caterpillars, which are distasteful to many birds, being a specialty of preference. It also occasionally eats eggs and chicks.

Breeding

This Eurasian reed warbler is raising a common cuckoo.

The common cuckoo is a brood parasite; it lays its eggs in the nests of other birds. At the appropriate moment, the hen cuckoo flies down to the host's nest, pushes one egg out of the nest, lays an egg and flies off. The whole process takes about 10 seconds. A female may visit up to 50 nests during a breeding season. Common cuckoos first breed at the age of two years.[2]

Egg mimicry

More than 100 host species have been recorded: meadow pipit, dunnock and Eurasian reed warbler are the most common hosts in northern Europe; garden warbler, meadow pipit, pied wagtail and European robin in central Europe; brambling and common redstart in Finland; and great reed warbler in Hungary.[3]

Female common cuckoos are divided into gentes – groups of females favouring a particular host species' nest and laying eggs that match those of that species in color and pattern. Evidence from mitochondrial DNA analyses suggest that each gene may have multiple independent origins due to parasitism of specific hosts by different ancestors.[14] One hypothesis for the inheritance of egg appearance mimicry is that this trait is inherited from the female only, suggesting that it is carried on the sex-determining W chromosome (females are WZ, males ZZ). A genetic analysis of gentes supports this proposal by finding significant differentiation in mitochondrial DNA, but not in microsatellite DNA.[14] A second proposal for the inheritance of this trait is that the genes controlling egg characteristics are carried on autosomes rather than just the W chromosome. Another genetic analysis of sympatric gentes supports this second proposal by finding significant genetic differentiation in both microsatellite DNA and mitochondrial DNA.[15] Considering the tendency for common cuckoo males to mate with multiple females and produce offspring raised by more than one host species, it appears as though males do not contribute to the maintenance of common cuckoo gentes. However, it was found that only nine percent of offspring were raised outside of their father's presumed host species.[15] Therefore, both males and females may contribute to the maintenance of common cuckoo egg mimicry polymorphism.[14][15] It is notable that most non-parasitic cuckoo species lay white eggs, like most non-passerines other than ground-nesters.

photo of box of cuckoo and reed warbler eggs
Cuckoo eggs mimicking smaller eggs, in this case of reed warbler

As the common cuckoo evolves to lay eggs that better imitate the host's eggs, the host species adapts and is more able to distinguish the cuckoo egg. A study of 248 common cuckoo and host eggs demonstrated that female cuckoos that parasitised common redstart nests laid eggs that matched better than those that targeted dunnocks. Spectroscopy was used to model how the host species saw the cuckoo eggs. Cuckoos that target dunnock nests lay white, brown-speckled eggs, in contrast to the dunnock's own blue eggs. The theory suggests that common redstarts have been parasitised by common cuckoos for longer, and so have evolved to be better than the dunnocks at noticing the cuckoo eggs.[16]

Studies were made of 90 great reed warbler nests in central Hungary. There was an "unusually high" frequency of common cuckoo parasitism, with 64% of the nests parasitised. Of the nests targeted by cuckoos, 64% contained one cuckoo egg, 23% had two, 10% had three and 3% had four common cuckoo eggs. In total, 58% of the common cuckoo eggs were laid in nests that were multiply parasitised. When laying eggs in nests already parasitised, the female cuckoos removed one egg at random, showing no discrimination between the great reed warbler eggs and those of other cuckoos.[17]

It was found that nests close to cuckoo perches were most vulnerable: multiple parasitised nests were closest to the vantage points, and unparasitised nests were farthest away. Nearly all the nests "in close vicinity" to the vantage points were parasitised. More visible nests were more likely to be selected by the common cuckoos. Female cuckoos use their vantage points to watch for potential hosts and find it easier to locate the more visible nests while they are egg-laying.[18]

The great reed warblers' responses to the common cuckoo eggs varied: 66% accepted the egg(s); 12% ejected them; 20% abandoned the nests entirely; 2% buried the eggs. 28% of the cuckoo eggs were described as "almost perfect" in their mimesis of the host eggs, and the warblers rejected "poorly mimetic" cuckoo eggs more often. The degree of mimicry made it difficult for both the great reed warblers and the observers to tell the eggs apart.[17]

The egg measures 22 by 16 millimetres (0.87 in × 0.63 in) and weighs 3.2 grams (0.11 oz), of which 7% is shell.[2] Research has shown that the female common cuckoo is able to keep its egg inside its body for an extra 24 hours before laying it in a host's nest. This means the cuckoo chick can hatch before the host's chicks do, and it can eject the unhatched eggs from the nest. Scientists incubated common cuckoo eggs for 24 hours at the bird's body temperature of 40 °C (104 °F), and examined the embryos, which were found "much more advanced" than those of other species studied. The idea of 'internal incubation' was first put forward in 1802 and 18th and 19th Century egg collectors had reported finding that cuckoo embryos were more advanced than those of the host species.[19]

Chicks

A chick of the common cuckoo in the nest of a tree pipit

The naked, altricial chick hatches after 11–13 days.[2] It methodically evicts all host progeny from host nests. It is a much larger bird than its hosts, and needs to monopolize the food supplied by the parents. The chick will roll the other eggs out of the nest by pushing them with its back over the edge. If the host's eggs hatch before the cuckoo's, the cuckoo chick will push the other chicks out of the nest in a similar way. At 14 days old, the common cuckoo chick is about three times the size of an adult Eurasian reed warbler.

The necessity of eviction behavior is unclear. One hypothesis is that competing with host chicks leads to decreased cuckoo chick weight, which is selective pressure for eviction behavior. An analysis of the amount of food provided to common cuckoo chicks by host parents in the presence and absence of host siblings showed that when competing against host siblings, cuckoo chicks did not receive enough food, showing an inability to compete.[27] Selection pressure for eviction behavior may come from cuckoo chicks lacking the correct visual begging signals, hosts distributing food to all nestlings equally, or host recognition of the parasite.[27][28] Another hypothesis is that decreased cuckoo chick weight is not selective pressure for eviction behavior. An analysis of resources provided to cuckoo chick in the presence and absence of host siblings also showed that the weights of cuckoos raised with host chicks were much smaller upon fledging than cuckoos raised alone, but within 12 days cuckoos raised with siblings grew faster than cuckoos raised alone and made up for developmental differences, showing a flexibility that would not necessarily select for eviction behavior.[29]

Species whose broods are parasitised by the common cuckoo have evolved to discriminate against cuckoo eggs but not chicks.[30] Experiments have shown that common cuckoo chicks persuade their host parents to feed them by making a rapid begging call that sounds "remarkably like a whole brood of host chicks." The researchers suggested that "the cuckoo needs vocal trickery to stimulate adequate care to compensate for the fact that it presents a visual stimulus of just one gape."[28] However, a cuckoo chick needs the amount of food of a whole brood of host nestlings, and it struggles to elicit that much from the host parents with only the vocal stimulus. This may reflect a tradeoff—the cuckoo chick benefits from eviction by receiving all the food provided, but faces a cost in being the only one influencing feeding rate. For this reason, cuckoo chicks exploit host parental care by remaining with the host parent longer than host chicks do, both before and after fledging.[28]

Common cuckoo chicks fledge about 17–21 days after hatching,[2] compared to 12–13 days for Eurasian reed warblers.[31] If the hen cuckoo is out-of-phase with a clutch of Eurasian reed warbler eggs, she will eat them all so that the hosts are forced to start another brood.

The common cuckoo's behaviour was firstly observed and described by Aristotle and the combination of behaviour and anatomical adaptation by Edward Jenner, who was elected as Fellow of the Royal Society in 1788 for this work. It was first documented on film in 1922 by Edgar Chance and Oliver G Pike, in their film 'The Cuckoo's Secret'.[32]

A study in Japan found that young common cuckoos probably acquire species-specific feather lice from body-to-body contact with other cuckoos between the time of leaving the nest and returning to the breeding area in spring. A total of 21 nestlings were examined shortly before they left their hosts' nests and none carried feather lice. However, young birds returning to Japan for the first time were found just as likely as older individuals to be lousy.[33]

As a biodiversity indicator

The occurrence of common cuckoo in Europe is a good surrogate for biodiversity facets including taxonomic diversity and functional diversity in bird communities, and better than the traditional use of top predators as bioindicators. The reason for this is the strong correlation between the cuckoo's host species richness and overall bird species richness, due to co-evolutionary relationships.[34] This may be useful for citizen science.[35]

In culture

Further information: Birds in culture

Aristotle was aware of the old tale that cuckoos turned into hawks in winter. The tale was an explanation for their absence outside the summer season, later accepted by Pliny the Elder in his Natural History. Aristotle rejected the claim, observing in his History of Animals that cuckoos do not have the predators' talons or hooked bills. These Classical era accounts were known to the Early Modern English naturalist, William Turner.[10]

The 13th century medieval English round, "Sumer Is Icumen In", celebrates the cuckoo as a sign of spring, the beginning of summer, in the first stanza, and in the chorus:[36]

Middle English

Svmer is icumen in
Lhude sing cuccu
Groweþ sed
and bloweþ med
and springþ þe wde nu
Sing cuccu
Modern English

Summer has arrived,
Sing loudly, cuckoo!
The seed is growing
And the meadow is blooming,
And the wood is coming into leaf now,
Sing, cuckoo!

In England, William Shakespeare alludes to the common cuckoo's association with spring, and with cuckoldry,[37] in the courtly springtime song in his play Love's Labours Lost:[38][39]

When daisies pied and violets blue
And lady-smocks all silver-white
And cuckoo-buds of yellow hue
Do paint the meadows with delight,
The cuckoo then, on every tree,
Mocks married men; for thus sings he: 
"Cuckoo;
Cuckoo, cuckoo!" O, word of fear,
Unpleasing to a married ear!

In Europe, hearing the call of the common cuckoo is regarded as the first harbinger of spring. Many local legends and traditions are based on this. In Scotland, Gowk Stones (cuckoo stones) sometimes associated with the arrival of the first cuckoo of spring. "Gowk" is an old name for the common cuckoo in northern England,[40] derived from the harsh repeated "gowk" call the bird makes when excited.[3] The well-known cuckoo clock features a mechanical bird and is fitted with bellows and pipes that imitate the call of the common cuckoo.[41] Cuckoos feature in traditional rhymes, such as '"In April the cuckoo comes, In May she'll stay, In June she changes her tune, In July she prepares to fly, Come August, go she must,"' quoted Peggy. 'But you haven't said it all,' put in Bobby. '"And if the cuckoo stays till September, It's as much as the oldest man can remember."'[42]

References

  1. 1 2 3 BirdLife International (2012). "Cuculus canorus". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
  2. 1 2 3 4 5 6 7 Robinson, R. A. (2005). "Cuckoo Cuculus canorus". BirdFacts: Profiles of Birds Occurring in Britain & Ireland. British Trust for Ornithology. BTO Research Report 407. Retrieved 12 August 2011.
  3. 1 2 3 4 5 6 Snow, D. W.; Perrins, C. (1997). The Birds of the Western Palearctic (Abridged ed.). Oxford University Press. ISBN 0-19-854099-X.
  4. ↑ "Cuckoo". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. (Subscription or UK public library membership required.)
  5. ↑ Jobling, James A (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. pp. 89, 124. ISBN 978-1-4081-2501-4.
  6. ↑ "Common Cuckoo (Cuculus canorus)". Internet Bird Collection. Lynx Edicions. Retrieved 20 August 2011.
  7. 1 2 3 4 5 Mullarney, K.; Svensson, L.; Zetterstrom, D.; Grant, P. (1999). Collins Bird Guide. HarperCollins. pp. 204–205. ISBN 0-00-219728-6.
  8. 1 2 3 4 5 6 Baker, K. (1993). Identification Guide to European Non-Passerines. British Trust for Ornithology. pp. 273–275. ISBN 0-903793-18-0. BTO Guide 24.
  9. ↑ Welbergen, J.; Davies, N. B. (2011). "A parasite in wolf's clothing: hawk mimicry reduces mobbing of cuckoos by hosts". Behavioral Ecology. 22 (3): 574–579. doi:10.1093/beheco/arr008.
  10. 1 2 Davies, N. B.; Welbergen, J. A. (2008). "Cuckoo–hawk mimicry? An experimental test". Proceedings of the Royal Society B: Biological Sciences. 275 (1644): 1811–1816. doi:10.1098/rspb.2008.0331. PMC 2587796Freely accessible. PMID 18467298.
  11. 1 2 Thorogood, R.; Davies, N. B. (2012). "Cuckoos combat socially transmitted defenses of reed warbler hosts with a plumage polymorphism". Science. 337: 578–580. doi:10.1126/science.1220759.
  12. ↑ Barrett, M. (1897). "The Cuckoo's Notes". The Musical Times and Singing Class Circular. 38 (656): 697. doi:10.2307/3367962. JSTOR 3367962.
  13. ↑ Ali, Salim; Ripley, S. Dillon (1981). Handbook of the birds of India and Pakistan together with those of Bangladesh, Nepal, Bhutan and Ceylon. Volume 3. Stone Curlews to Owls. (2nd ed.). Oxford University Press. p. 209.
  14. 1 2 3 Gibbs, H. L.; Sorenson, M. D.; Marchetti, K.; Brooke, M. D.; Davies, N. B.; Nakamura, H. (2000). "Genetic evidence for female host-specific races of the common cuckoo". Nature. 407: 183–186. doi:10.1038/35025058.
  15. 1 2 3 Fossoy, F.; Antonov, A.; Moksnes, A.; Roskfaft, E.; Vikan, J. R.; Moller, A. P.; Shykoff, J. A.; Stokke, B. G. (2011). "Genetic differentiation among sympatric cuckoohost races: Males matter". Proceedings of the Royal Society B. 278: 1639–1645. doi:10.1098/rspb.2010.2090.
  16. ↑ Brennand, E. (24 March 2011). "Cuckoo in egg pattern 'arms race'". BBC News. Retrieved 22 August 2011.
  17. 1 2 Moskát, C.; Honza, M. (2002). "European Cuckoo Cuculus canorus parasitism and host's rejection behaviour in a heavily parasitized Great Reed Warbler Acrocephalus arundinaceus population". Ibis. 144 (4): 614–622. doi:10.1046/j.1474-919X.2002.00085.x.
  18. ↑ Moskát, C.; Honza, M. (2000). "Effect of nest and nest site characteristics on the risk of cuckoo Cuculus canorus parasitism in the great reed warbler Acrocephalus arundinaceus". Ecography. 23 (3): 335–341. doi:10.1111/j.1600-0587.2000.tb00289.x.
  19. ↑ Moskvitch, K. (24 September 2010). "Extra incubation time lets cuckoo chicks pop out early". BBC News. Retrieved 22 August 2011.
  20. ↑ Numerov, A. D. Inter-species and Intra-species brood parasitism in Birds. Voronezh: Voronezh University. 2003. 516 p. [In Russian] Нумеров А. Д. Межвидовой и внутривидовой гнездовой паразитизм у птиц. Воронеж: ФГУП ИПФ Воронеж. 2003. C. 38-40.
  21. ↑ as group of subspecies Carduelis carduelis caniceps of European goldfinch here
  22. ↑ The species is included in Emberiza bruniceps now
  23. ↑ Turdus erythrogaster Vigors, Proc. Zool. Soc. London, 1831, p. 171.; Monticola erythrogastra Baker, Faun. Brit. Ind., 2, p. 170. This form is recognized as younger synonym of Monticola rufiventris (Jardine and Selby)
  24. ↑ Unknown name
  25. ↑ There is the name Saxicola torquata sensu lato in the list, but now this species was split for three. In Western Siberia 25% of cuckoo's eggs (n=126) was found in the nests of Saxicola maura. The names changed according this information. (Numerov, A. D. Order Cuculiformes. // Birds of Russia and adjacent countries. Moscow: Nauka. 1993. P. 212 [In Russian]).
  26. ↑ The species is repeated twice in the list
  27. 1 2 Martín-Gálvez, D.; Soler, M.; Soler, J. J.; Martín-Vivaldi, M.; Palomino, J. J. (2005). "Food acquisition by common cuckoo chicks in rufous bush robin nests and the advantage of eviction behaviour". Animal Behavior. 70: 1313–1321. doi:10.1016/j.anbehav.2005.03.031.
  28. 1 2 3 Davies, N. B.; Kilner, R. M.; Noble, D. G. (1998). "Nestling cuckoos, Cuculus canorus, exploit hosts with begging calls that mimic a brood". Proceedings of the Royal Society B. 265 (1397): 673–678. doi:10.1098/rspb.1998.0346. PMC 1689031Freely accessible.
  29. ↑ Geltsch, N.; Hauber, M. E.; Anderson, M. G.; Ban, M.; Moskát, C. (2012). "Competition with a host nestling for parental provisioning imposes recoverable costs on parasitic cuckoo chick's growth". Behavioural Processes. 90: 378–383. doi:10.1016/j.beproc.2012.04.002.
  30. ↑ Davies, N. B.; de L. Brooke, M. (1989). "An experimental study of co-evolution between the Cuckoo, Cuculus canorus, and its hosts. II. Host egg markings, chick discrimination and general discussion". Journal of Animal Ecology. 58 (1): 225–236. doi:10.2307/4996. JSTOR 4996.
  31. ↑ Robinson, R. A. (2005). "Reed Warbler Acrocephalus scirpaceus". BirdFacts: Profiles of Birds Occurring in Britain & Ireland. British Trust for Ornithology. BTO Research Report 407. Retrieved 12 August 2011.
  32. ↑ "Oliver Pike". WildFilmHistory. Retrieved 25 September 2010.
  33. ↑ de L. Brooke, M.; Nakamura, H. (1998). "The acquisition of host-specific feather lice by common cuckoos (Cuculus canorus)". Journal of Zoology. 244 (2): 167–173. doi:10.1111/j.1469-7998.1998.tb00022.x.
  34. ↑ Tryjanowski, P.; Morelli, F. (2015). "Presence of Cuckoo reliably indicates high bird diversity: A case study in a farmland area". Ecological Indicators. 55: 52–58. doi:10.1016/j.ecolind.2015.03.012.
  35. ↑ Morelli, F.; Jiguet, F.; Reif, J.; Plexida, S.; Suzzi Valli, A.; Indykiewicz, P.; Šímová, S.; Tichit, M.; Moretti, M.; Tryjanowski, P. (2015). "Cuckoo and biodiversity: testing the correlation between species occurrence and bird species richness in Europe". Biological Conservation. 190: 123–132. doi:10.1016/j.biocon.2015.06.003.
  36. ↑ Wulstan, David (2000). "'Sumer Is Icumen In': A Perpetual Puzzle-Canon?". Plainsong and Medieval Music. 9 (1 (April)): 1–17.
  37. ↑ "Cuckold". Online Etymology Dictionary. Retrieved May 2015. Check date values in: |access-date= (help)
  38. ↑ Shakespeare, William. "Song: "When daisies pied and violets blue"". Poetry Foundation. Retrieved 22 July 2015.
  39. ↑ Rhodes, Neil; Gillespie, Stuart (13 May 2014). Shakespeare And Elizabethan Popular Culture: Arden Critical Companion. Bloomsbury Publishing. p. 178. ISBN 978-1-4081-4362-9.
  40. ↑ Lockwood, W. B. (1993). The Oxford Dictionary of British Bird Names. Oxford University Press. ISBN 978-0-19-866196-2.
  41. ↑ "Beginners Guide". Cuckoo Clock World. Retrieved 21 April 2016.
  42. ↑ Brazil, Angela (1915). A Terrible Tomboy. Project Gutenberg EBook #38619.

Further reading

  • Wyllie, Ian (1981). The Cuckoo. London: B.T. Batsford. 
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