Figure 1: Male Eudynamys scolopaceus.
Source: Jason Thompson, 2013 (Wikimedia Commons)
Figure 2: Female Eudynamys scolopaceus.
Source: Vasu, V.R., 2011 (Wikimedia Commons)

Asian Koel

Eudynamys scolopaceus (Linnaeus, 1758)

The Asian koel (Eudynamys scolopaceus) is a long-tailed cuckoo that inhabits many parts of Asia.
Males and females look and sound different.
It displays brood parasitism, targeting hosts like the house crow (Corvus splendens).
Its population is believed to have been increasing in Singapore, possibly due to (1) it parasitizing the once large house crow population, and (2) its ability to thrive in some urban areas.

Table of Contents

1 Nomenclature

Binomial name: Eudynamys scolopaceus (Linnaeus, 1758)
Synonym: Eudynamys scolopacea (Sibley & Monroe, 1990)

Vernacular names: A variety of vernacular names are given, including but not limited to: Asian koel, Eastern koel, Western koel, Pacific koel, Indian koel, Malayan koel, Common koel, Rainbird, Stormbird, Black cuckoo, 噪鹃 (in Chinese), Burung Sewah Tahu (in Malay)
1 2

One of the reasons for such a large number of common names is that the E. scolopaceus can be found in many regions of the culturally diverse continent, Asia (see Distribution). Another reason is that definition of the species is still under debate (see Variations in taxonomic classification). To minimise confusion, the scientific name Eudynamys scolopaceus will be used throughout this article.

1.1 Etymology

The generic name Eudynamys was coined by Vigors & Horsfield in 1826, from the derivative Greek word dunamis, meaning power or might, with the prefix eu-, meaning good, well, or normal 2 .

Scolopaceus means snipe-like, and is derived by adding the suffix -aceus to the Latin word scolopax, which in turn is derived from scolopakos, Greek for woodcock. Since Eudynamys scolopaceus does not possess a snipe-like bill, this could be a reference to the female’s cryptic striped colouration
2 .

The common name koel is onomatopoeic* in nature, with a number of language variants. It originates from the Tamil word kuyil or the Hindi word koil, reflecting the male’s distinct call
3 4 .

* Onomatopoeic: derived from the associated sound (cuckoo is also an onomatopoeic word).

2 Description

Note: Since there is more than one definition of Eudynamys scolopaceus, the description is made in reference to the nominate race Eudynamys scolopaceus scolopaceus, which is the first named race of the species.

The female can be easily diagnosed with its distinct brown and white pattern, but the glossy bluish-black male may be confused with similar-looking birds like the house crow.
Adults have crimson irises; juveniles have darker ones and resemble adult females.

Eudynamys scolopaceus is a large cuckoo measuring 39–46 cm (from bill tip to tail tip) and weighing 190–327 g
5 6 . It has relatively short wings, but a rather long tail7 . Its thick, large bill is slightly curved downwards and is pale green, but darker and bluish along the edges of both mandibles8 . Its irises are crimson, while its legs and feet are pale grey5 . It is also sexually dimorphic (i.e. males and females look different). Refer to this webpage to learn about the different parts of a bird.

2.1 Male

Males have a glossy bluish-black plumage which may appear dark purple at times (Figure 3) 9 .

Figure 3: Male Eudynamys scolopaceus with distinctive features. Adapted from Challiyan, 2008 (Wikimedia Commons)

2.2 Female

Females have a dark brown crown with rufous streaks on the head. The back, rump and wing coverts are dark brown with creamy-white or rufous speckles. The underparts are cream to whitish, with fine dark brown bars. The tail is barred dark brown and creamy-white or rufous 7 10 .

Figure 4: Front view of Female Eudynamys scolopaceuswith distinctive features. Adapted from K. Hari Krishnan, 2014 (Wikimedia Commons)Figure 5: Rear view of Female Eudynamys scolopaceuswith distinctive features. Adapted from Doug Janson, 2008 (Wikimedia Commons)

2.3 Juvenile

Juveniles are uniformly black after hatching, but moult quickly to resemble adult females. However, their irises are darker (Figure 6)8 .

Young males often have coverts faded blackish-brown with white tips. The unmoulted wing feathers sometimes retain residual white barring, and paler tips to the edges of primaries and wing coverts (Figure 7)
8 .

Figure 6: Immature Eudynamys scolopaceus. Note the black crown and darker iris, with newer, moulted feathers resembling those of the adult female.Source: J. M. Garg, 2006 (Wikimedia Commons)Figure 7: Immature male Eudynamys scolopaceus. Note the darker iris and unmoulted wing feathers retaining residual white barring.Source: Amar-Singh H.S.S., 2011 (permission obtained)

2.4 Diagnosis

While the female Eudynamys scolopaceus has diagnostic features, the male is often confused with other species of birds.

Due to the similar size and plumage, it may be mistaken for a crow. In Singapore, there are two species of crows: the house crow (Corvus splendens) and the large-billed crow (Corvus macrorhynchos). Refer to Figures 3, 8, and 9 to distinguish the male E. scolopaceus from C. splendens and C. macrorhynchos 
11 .

Figure 8: House crow (Corvus splendens) with features shown. Adapted from Muhammad Mahdi Karim, 2009 (Wikimedia Commons)Figure 9: Large-billed crow (Corvus macrorhynchos) with features shown. Adapted from Francisco Restivo, 2010 (Wikimedia Commons)

While the Asian glossy starling (Aplonis panayensis) has a similar plumage and red irises (Figure 10), it can be distinguished from the male E. scolopaceus by its much smaller size (20 cm from bill tip to tail tip)
12 .

Figure 10: Asian glossy starling (Aplonis panayensis) with features shown. Adapted from Yap Lip Kee, 2005 (Wikimedia Commons)

Table 1: Comparison of features among male Eudynamys scolopaceusCorvus splendensCorvus macrorhynchos, and Aplonis panayensis.

SpeciesMale Asian koel(Eudynamys scolopaceus)House crow(Corvus splendens)Large-billed crow(Corvus macrorhynchos)Asian glossy starling(Aplonis panayensis)
Length (bill tip to tail tip)39–46 cm40–43 cm46–59 cm20 cm
Colour of irisCrimson Dark brown or black Dark brown or black Red
BillThick, large, pale greenMore slender, blackThick, large, blackLess curved, black
PlumageGlossy bluish-blackRich black, with grey-brown neck and breastGlossy blackGlossy greenish-/bluish-black overall, matt black on vent
Colour of legs and feetPale greyBlackBlackBlack

3 Ecology and behaviour

3.1 Vocalisation

The loud, unmistakable calls of Eudynamys scolopaceus can be heard throughout the day.
Calls produced by the males and females are different.

With its loud, distinct calls, Eudynamys scolopaceus is more often heard than seen. The calls can be heard throughout the day, even late at night, and especially early in the morning. It is especially vocal during breeding seasons.
The calls of males and females of this species differ and can be easily distinguished. The male produces a dissyllabic ‘koo-Ooo’ call, with emphasis on the second syllable. It is usually repeated several times, increasing in pitch and loudness with each successive call, then stopped abruptly
13 14 . This type of call can be used to proclaim its territory8 .

The male also produces a continuous excited ‘kwok-kwok-kwok’ call, which can be described as bubbly. However, this type of call has been observed to accompany aggressive behaviour among rival males 15 .

The female makes a continuous and shrill ‘kik-kik-kik’ call.

Due to E. scolopaceus being a brood parasite (link to 3.4 breeding and reproduction), juveniles may learn to imitate the calls of their host parents’ young, though this is not always the case. Click here for a video of a juvenile female calling like a crow. 

3.2 Habitat

Eudynamys scolopaceus can be found in both natural and man-made habitats.

Eudynamys scolopaceus resides in a variety of natural and man-made habitats, such as light woodland, mangroves, plantations, gardens, parks, and low-density urban areas. It is rarely found in forests, though it can be found around the fringes of secondary forests 16 17 .

3.3 Diet and feeding habits

Adults mainly feed on fruits, but consume insects and eggs of small birds as well. 

Adults are largely frugivorous, feeding on the fruits of plants like the Ceram palm (Rhopaloblaste ceramica), yellow oleander (Thevetia peruviana), and Indian sandalwood (Santalum album) 18 19 . Occasionally, they feed on insects and eggs of small birds as well 20 . They are shy, arboreal (tree-dwelling) birds, and usually do not venture out of the canopy to feed 21 .

3.4 Breeding and reproduction

3.4.1 Brood parasitism

Eudynamys scolopaceus is a brood parasite*. Its hosts include crows and mynas. 

Eudynamys scolopaceus is a brood parasite*, and parasitises a range of hosts, including the house crow (Corvus splendens), Javan myna (Acridotheres javanicus), common myna (Acridotheres tristis), and long-tailed shrike (Lanius schach). The black-naped oriole (Oriolus chinensis) is also a possible host 22 23 .
In Singapore, this brood parasitism behaviour may provide ecological benefits in the form of house crow (C. splendens) population management (see Distribution in Singapore).The C. splendens population in Singapore had risen rapidly since 1985 and were seen as pests, prompting measures such as culling to curb the population growth
24 . Brood parasitism by E. scolopaceus could have lowered the C. splendens population further, but there has not been significant correlation between changes in E. scolopaceus and C. splendens populations 25 .

* Brood parasites manipulate other individuals of the same species or another species (hosts) so that the host raises the young of the parasite. Cuckoos are the most well-known example, though this behaviour can be found in insects and fish as well.

3.4.2 Breeding season

The breeding season of Eudynamys scolopaceus typically corresponds to that of its usual host.

The breeding season of Eudynamys scolopaceus typically corresponds to that of its usual host. For example, if the usual host is the house crow (Corvus splendens), it will be roughly every three months, throughout the year 26 27 .

3.4.3 Courtship

Courtship behaviour has not been well-studied.
However, males do call to proclaim their territory and display aggressiveness, and have been observed to offer food to females.

Courtship behaviour in Eudynamys scolopaceus has not been well-studied. However, it is known that the ‘koo-Ooo’ call is used by males to proclaim their territory, and that rival males confront one another with increasing aggressiveness by flapping their wings and fanning their tails, along with loud ‘kwok-kwok-kwok’ calls [8]. These behaviours may better the chances of males securing mates.
Courtship feeding, in which the male feeds the female with fruits or insects, has been observed in India, Australia, and more recently in Singapore
28 29 30 31

3.4.4 Egg laying and parental care

The female sneaks into a host’s nest to lay its egg while the male distracts the host.
The egg usually hatches before the host’s eggs, and the chick may mimic begging calls of the host’s chicks to secure parental care.

The female Eudynamys scolopaceus can lay several eggs per breeding cycle, usually laying an egg in each nest she visits, after the host has laid its first egg 26 32 .
To allow the female to approach the host’s nest to lay its egg, the male calls loudly close to the nest to advertise its presence, tempting the hosts to give chase. Meanwhile, the female conceals itself nearby. After the hosts are lured far enough, it slips into the nest to lay its egg swiftly
13 . It is unclear whether the hosts’ eggs are destroyed by the female.

The eggs of E. scolopaceus, although slightly smaller, resemble crow eggs. They can vary from pale greenish-yellow to greyish-green, with reddish-brown speckles and blotches
33 . Therefore, coevolution* of E. scolopaceus and its hosts may have resulted in these eggs matching the eggs of the hosts.

Given that E. scolopaceus eggs have a shorter incubation period than crow eggs (13–14 days compared to 16–20 days), E. scolopaceus tend to hatch first, and the hatchlings could possibly evict host eggs or chicks from the nest34 .

After a nesting period of 19–28 days, E. scolopaceus fledglings continue to be fed by their foster parents for another two to three weeks
34 . Although they may mimic the begging call of the hosts’ young , it is not always the case. Therefore, it is possible that female E. scolopaceus do feed their young34 , if there is a lack of parental care by the host parents due to the chicks being unable to mimic such calls. However, this claim has not been supported. 

Video of Corvus splendens foster parents feeding Eudynamys scolopaceus chicks:

* Coevolution is used to describe cases where two (or more) species influence each other's evolution.

4 Distribution

4.1 Global

Eudynamys scolopaceus can be found in many parts of Asia, ranging from Pakistan to Indonesia.

Eudynamys scolopaceus resides in much of Asia, ranging from Pakistan to Indonesia. Some populations are vagrant, migrating to warmer regions during winter. Refer to Figure 11 for the global distribution of E. scolopaceus 35 .

Figure 11: Global distribution of Eudynamys scolopaceus.Source: BirdLife International, 2012. IUCN Red List of Threatened Species Version 2014.3 (in accordance with Terms and Conditions)

4.2 Singapore

In 2009, Eudynamys scolopaceus was the 20th most common bird in Singapore.
Its success may be attributed to the growing house crow (Corvus splendens) population from the 1980s to 2003.

The population of Eudynamys scolopaceusin Singapore has not been determined, but the 24th Annual Bird Census conducted by the Nature Society (Singapore) in 2009 found it to be the 20th most numerous avian species in Singapore 36 .

The breeding population of E. scolopaceus has become widespread since 198737 . This was perhaps aided by the escalating house crow (Corvus splendens) population. After population management strategies implemented in 2003 caused the C. splendens population to be greatly reduced, it is believed that E. scolopaceus continued to thrive by turning towards other host species, such as the Javan myna (Acridotheres javanicus), the most common avian species in Singapore 23 38 . In addition, the now more scattered C. splendens population results in increased vulnerability to brood parasitism by E. scolopaceus, since nesting in groups could lower the occurrence of brood parasitism23 .

The proliferation of E. scolopaceus in Singapore has led to some residents’ unhappiness over their loud calls, while others are more tolerant of them. Read about the different opinions at the following links: link 1link 2link 3link 4.

5 Conservation status

Globally, Eudynamys scolopaceus is a species of least concern, but it is a protected species in Singapore.

Conservation status: least concern (IUCN 3.1) 39
Although the population of Eudynamys scolopaceus is not known, it occupies a large range globally, and its population trend appears to be stable
40 . Being able to survive in some urban areas (see Habitat), urbanisation does not appear to pose much of a threat to it.

In Singapore, E. scolopaceus is a species protected under the Wild Animals and Birds Act, and is not listed under the Schedule

6 Taxonomy and systematics

6.1 Taxonavigation

Eudynamys scolopaceus was originally known as Cuculus scolopaceus until 1827.

Table 2 provides a hierarchical summary of clade names in the taxonomic classification of Eudynamys scolopaceus.
Table 2: Taxonavigation of Eudynamys scolopaceus.

E. scolopaceus (Linnaeus, 1758)

E. scolopaceus was originally described by Linnaeus as Cuculus scolopaceus based on a specimen he received from the Malabar region 41 . It was later moved to the new genus Eudynamys by Vigors and Horsfield in 1827 as it has a relatively more powerful bill and stronger tarsi and feet than true Cuculus cuckoos41 .

6.2 Phylogeny

The evolutionary history of Eudynamys scolopaceus is still unclear.

There has been much uncertainty on the phylogeny of taxa in Aves. Mayr (2008) collated the genetic and morphological information from previous studies to produce the following trees in Figure 12 42 . The Tree of Life Web Project offers a comprehensive explanation on interpreting tree diagrams.

Figure 12: Phylogeny of Cuculidae among Neognathous birds derived from (a) a Bayesian analysis of five nuclear genes (β-fibrinogen, c-myc, RAG-1, myoglobin, and ornithine decarboxylase) and (b) a parsimony analysis of 2954 morphological characters. Nodes with posterior probability below 95% were collapsed in (a), while only bootstrap support values above 80% were shown in (b). Source: Mayr, 2008 (permission pending)

Phylogeny within Cuculidae has also been unclear. The Tree of Life Web Project displays the following tree for the subfamily Cuculinae, consisting of Old World parasitic cuckoos (Figure 13) 43 .

Figure 13: Phylogeny within Cuculinae, with position of Eudynamys shown. Adapted from Tree of Life Web Project, 2007 (permission pending)

With respect to 135 osteological characters, Hughes (2000) placed Eudynamys as a sister taxon to Urodynamis(Figure 14) 44 . This classification was shown to support the evolution of brood parasitism in a single event instead of three events as previously proposed, as all brood parasitic cuckoos formed a clade44 .

Figure 14: Optimal hypothesis of phylogeny for 33 cuckoo genera, with position of the monophyletic clade containing Eudynamys and Urodynamis shown. Source: Hughes, 2000 (permission pending)

6.3 Variations in taxonomic classification

There are 18 species and subspecies identified, but this has not been agreed upon.
Some believe they should all be considered one species, while others cluster the species and subspecies to varying degrees.

Eudynamys scolopaceus displays variations across its geographical range, with several island populations established. Some consider the black-billed koel (E. melanorhynchus) and Pacific koel (E. orientalis) conspecific with E. scolopaceus. In this case, the “combined” species E. scolopaceus is known as the common koel. Another way of classification is to consider E. melanorhynchus as a separate species, with E. scolopaceus encompassing E. orientalis and all its subspecies, with the exception of the Australian koel (E. cyanocephalus). Alternatively, the three are considered separate species, owing to differences in plumage, bill colour, and vocalisations. The last view is becoming increasingly accepted 30 .

According to the 2012 Clements Checklist of Birds of the World, a regularly updated checklist maintained by the Cornell Lab of Ornithology, 18 species and subspecies have been identified 1 . A summary is provided in Table 3.

Table 3: Species and subspecies recognised by the 2012 Clements Checklist, with their respective geographical range.

SpeciesSubspeciesAuthorityGeographical range
Eudynamys scolopaceus
(Linnaeus, 1758)Tropical southern Asia to south China and Greater Sundas

Eudynamys scolopaceus scolopaceus(Linnaeus, 1758)Nepal to Pakistan, India, Sri Lanka, Laccadives and Maldives

Eudynamys scolopaceus chinensisCabanis & Heine, 1863Southern China and Indochina; winters to Borneo

Eudynamys scolopaceus hartertiIngram, 1912Hainan (Southern China)

Eudynamys scolopaceus malayanusCabanis & Heine, 1863Northeast India to Thailand, Malaya, Sumatra, Borneo and Lesser Sundas

Eudynamys scolopaceus simalurensis
Simeulue, Indonesia (off West Sumatra)

Eudynamys scolopaceus mindanensis(Linnaeus, 1766)Philippines, Palawan, Sulu Archipelago, Sangihe, Indonesia and Talaud Islands

Eudynamys scolopaceus corvinus
North Moluccas (Morotai, Halmahera, Ternate, Tidore and Bacan)

Eudynamys scolopaceus frater
Northern Philippines (Calayan and Fuga)
Eudynamys orientalis
(Linnaeus, 1766)South Moluccas (Buru, Manipa, Kelang, Seram, Ambon, Watubela)

Eudynamys orientalis orientalis(Linnaeus, 1766)South Moluccas (Buru, Manipa, Kelang, Seram, Ambon, Watubela)

Eudynamys orientalis [rufiventer or minimus](Lesson, 1830)New Guinea

Eudynamys orientalis salvadoriiHartert, 1900Bismarck Archipelago

Eudynamys orientalis albertiRothschild & Hartert, 1907Solomon Islands

Eudynamys orientalis picatusMüller, 1843Kai Islands and Sumba to Timor and Roma
Eudynamys cyanocephalus


Eudynamys cyanocephalus cyanocephalus(Latham, 1801)Northern Queensland to Southern New South Wales; winters to Moluccas

Eudynamys cyanocephalus subcyanocephalusMatthews, 1912Northwest Australia to Northwest Queensland; winters to South Moluccas
Eudynamys melanorhynchus
Müller, 1843Sulawesi, Sula Islands

Eudynamys melanorhynchus melanorhynchus

Eudynamys melanorhynchus facialis
Sula Islands

Figure 15 shows the distribution of four E. scolopaceus subspecies: E. s. chinensis, E. s. malayanus, E. s. mindanensis, and E. s. scolopaceus.

Figure 15: Geographical distribution of Eudynamys scolopaceus chinensisE. s. malayanusE. s. mindanensis, and E. s. scolopaceus.Source: xeno-canto, 2014 (permission pending)

7 Biogeography

A study by Posso and Donatelli (2012) found that cuckoos that live in trees (arboreal) originated in South America, then spread to other continents.

Using the Principle of Parsimony based on primary and secondary “Brooks Parsimony Analysis” (BPA), Posso and Donatelli (2012) proposed that arboreal cuckoos originated in South America, and dispersed to inhabit other continents thereafter (Figure 17) 45 . This is because Coccyzus, the most basal genus in Cuculinae, is found in South America45 .

Figure 16: Strict concensus cladogram with bootstrap support values in parentheses. Spotted lines denote terrestrial/arboreal habits, thick lines denote terrestrial cuckoos, while thin lines denote arboreal cuckoos. Source: Posso & Donatelli, 2012 (permission pending)

Figure 17: Current distribution of basal cuckoos, with arrows showing the subsequent dispersion of arboreal cuckoos.Source: Posso & Donatelli, 2012 (permission pending)

8 Molecular data

GenBank is an open access database containing all publicly available nucleotide sequences and their protein translations.
It does not contain the full genome of Eudynamys scolopaceus, but a few of the genes can be found there.

The database GenBank contains the sequences of genes such as cytochrome oxidase subunit I (COI), cytochrome b (cytb), and NADH dehydrogenase subunit 2 (ND2), although the full genome of Eudynamys scolopaceus has not been sequenced.

9 References

Ref Notes
1 Avibase, 2014. Eudynamys [scolopaceus, orientalis, cyanocephalus or melanorhynchus]. Avibase. Retrieved 11 November 2014, from [ a b ]
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3 Avibase, 2014. Eudynamys [scolopaceus, orientalis, cyanocephalus or melanorhynchus]. Avibase. Retrieved 11 November 2014, from
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Last curated on 2014

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