By Mariano Gómez · Updated on 7 October 2026

Birds

Great Spotted Cuckoo, the crested cuckoo that breeds in Magpie nests

Clamator glandariusHear its song0:09

Photo gallery of the Great Spotted Cuckoo

Identification of the Great Spotted Cuckoo

The Great Spotted Cuckoo is a medium-sized bird, morphologically very like the Common Cuckoo, from which it differs by its more slender look, its longer tail and the colouring of the plumage. This is greyish brown on the upperparts, sprinkled with white spots, as are the wing feathers. The underparts are whitish, with the throat tinged yellowish ochre. On the head it wears a silver-grey cap, topped with a small, slightly erectile crest, and a red eye-ring.

The young bird has even showier colouring than the adults: a deep chocolate colour with abundant white spots on the back and white underparts, which turn yellowish ochre on the breast and neck. The flight feathers are a showy reddish colour, the cap is black and the eye-ring more conspicuous than the adults’.

Adult

• Greyish-brown back spotted with white; underparts whitish and throat yellowish ochre.
• Silver-grey cap with slightly erectile crest and red eye-ring.

Young bird

• Chocolate colour with white spots; reddish flight feathers and black cap.

Habitat and distribution of the Great Spotted Cuckoo

The species is distributed across different regions of central and southern Africa, with some isolated populations in the north of the continent and in the Middle East. In Europe it is a summer visitor that appears in different regions of the Mediterranean basin, such as the Iberian Peninsula, Turkey, southern France, Italy and Cyprus. Several subspecies are recognised, of which «glandarius» is the one present in Europe and the northern half of Africa.

In Spain it is distributed across much of the peninsular territory, although very scarce along the whole northern strip and Galicia, and it avoids high-altitude mountain areas. In the southern half its distribution is quite fragmentary, although it can be abundant in some places. It does not appear as a breeder in the Canaries, Ceuta and Melilla; in the Balearics it is found occasionally, but does not breed. Its distribution overlaps largely with that of the species it parasitises, the Eurasian Magpie and the Carrion Crow, and its expansion towards the coastal areas of Cádiz and Málaga seems to run parallel to that of its main host, the Magpie.

It settles where the species it parasitises abound, in particular the Magpie, so it is more frequent in open or semi-wooded areas, with crop fields, copses of different species (preferably pine woods), dehesas, river plains and mosaic farming landscapes, from sea level to 1,300 metres.

The most distant populations in the range (Mediterranean and southern African) migrate and winter in the tropical regions of Africa; it is possible that a small number of birds spend the whole winter in the south of the Peninsula. The return to the breeding areas takes place through February.

Etymology of the Great Spotted Cuckoo

«Clamator» is a Latin word meaning «shouter», from «clamare», «to shout». «Glandarius» is the Latin «of the acorns»: Linnaeus described it as «Cuculus glandarius», and the genus Clamator was introduced later, in 1829.

Population of the Great Spotted Cuckoo

In the 2021 European Red List of Birds the European breeding population is estimated at between 293,000 and 316,000 mature individuals, with a decreasing trend. Most of the European birds are in Spain, about 120,000 individuals. Although the trend on the Peninsula is considered stable, since 2008 a decline has been recorded, which might be due to the fall in insect populations through climate change and the abuse of insecticides and pesticides, or to a desynchronisation, caused by climate change, between its breeding and that of its hosts. It has already disappeared from some of its breeding areas, such as North Africa.

Nest of the Great Spotted Cuckoo

It does not build a nest: it practises brood parasitism, that is, it lays its eggs in the nest of another bird, normally a Magpie, which acts as host, incubating and then feeding the cuckoo’s offspring. Besides the Magpie, it can also parasitise other corvids, such as crows, jays or Iberian Magpies.

Courtship and breeding of the Great Spotted Cuckoo

Its breeding biology is closely tied to the Magpie’s life cycle: when Magpies begin their clutches, the cuckoo female produces a high number of eggs, and a single pair can parasitise up to 25 Magpie nests in a season. The eggs imitate those of the parasitised species perfectly and must be placed during their owners’ absence: it is common for the male to draw the attention of the Magpie pair while the female lays one to three eggs in the nest, not without first damaging or throwing out part of the legitimate clutch. After 11–15 days of incubation by the host, the parasite eggs hatch five or six days ahead of the Magpie’s. The cuckoo chicks usually soon do away with the Magpie chicks that have hatched, not by pushing them out of the nest as the Common Cuckoo does, but through competition for food or by suffocation and crushing, thanks to their greater development and bulk. They demand the parasitised pair’s care for a little under three weeks and, a few days after leaving the nest, join their biological parents, with whom they set off on migration to Africa.

Diet of the Great Spotted Cuckoo

It feeds basically on caterpillars of butterflies and moths, including species with stinging or toxic defences that other birds do not touch, so it avoids competition for resources. It commonly rubs certain caterpillars, such as the pine processionary, one of its habitual prey, against the ground or tree bark to strip them of their stinging hairs. It completes its diet with ants, grasshoppers, molluscs and the odd small vertebrate.

Curious facts about the Great Spotted Cuckoo

Spain has the largest European population of the species. It is able to eat caterpillars with stinging or toxic hairs, which no other bird touches. A single pair can parasitise up to 25 Magpie nests in a season.

The Great Spotted Cuckoo in Cabañeros

This website’s page on dehesas lists it as a parasite of Magpie nests and a species of Ethiopian affinity present in the dehesas of the park, and the one on grasslands counts it among the early «lookout» insectivores, on the raña of Cabañeros, together with the tits.

Where to see the Great Spotted Cuckoo in Cabañeros

In the dehesas and the raña of Cabañeros, where there are magpies.

When

From February to September: it arrives as early as February and leaves from July.

What time

Throughout the day, and its croak gives away its presence.

Where

In open or semi-wooded areas with magpies: crop fields, copses (above all pine woods), dehesas and river plains.

What to look for

A slender, crested cuckoo, spotted with white, with a yellowish throat and grey cap, among magpies.

Videos of the Great Spotted Cuckoo

Similar species

Common Cuckoo

Cuculus canorus

How to tell them apart

They are similar in appearance¹. It is medium-sized and of slender look, with a long tail and pointed wings; the male is grey, above all on the back, head and neck, with the underparts white and finely barred.

Photo: Alastair Rae, CC BY-SA 2.0

Eurasian Magpie

Pica pica

How to tell them apart

It does not look like it: it is the main host of the Great Spotted Cuckoo. It is mentioned because the cuckoo’s distribution overlaps largely with the Magpie’s, and its eggs imitate the Magpie’s perfectly.

Photo: Diego Delso, CC BY-SA 4.0

Other birds

Bibliography

• Jiménez García-Herrera, José. (2017). Aves de Cabañeros y su entorno. Madrid, Spain: Ecohábitat.
• SEO Birdlife - Sociedad Española de Ornitología
• https://es.wikipedia.org/
• Hume, Rob. (2016). Guía de campo de las Aves de España y Europa. Barcelona, Spain: Ediciones Omega