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cuckoo,common name for members of the extensive avian family Cuculidae, including the ani and the roadrunner (Geococcyx californianus), widely distributed in temperate and tropical regions. Cuckoos are slender-bodied, long-tailed birds with medium to stout down-curved bills, pointed wings, short legs (except in the terrestrial species), and dull (usually grayish brown or rufous) plumage. They are generally insectivorous and arboreal.
Of the parasitic Old World cuckoos, the common European cuckoo, Cuculus canorus, is typical. The female visits the nests of smaller birds, selecting those whose eggs match hers in color, and replaces an egg of the host with one of her own; she usually lays four or five eggs, each at 48-hr intervals and each in a different nest. Because the female can retain an egg inside inside its body longer, leading to internal incubation, the embryo is more developed when the egg is laid. The young cuckoo, hatching earlier and being larger than its nest mates, displaces them from the nest and becomes the sole recipient of its foster parents' care.
Each species of Old World cuckoo has its own unique pattern of parasitism, and different species choose different host species for their eggs. The cuckoo is referred to in the Bible, by Aristotle and Pliny, in mythology, and in English poetry. Its nesting habits have given us the word cuckold, and its simple but musical song, which gives it its name, was used by Beethoven in his Pastoral Symphony and is also imitated in the cuckoo clock.
The American cuckoos look like attenuated pigeons; they are not parasitic and build flimsy nests of twigs. Typical are the black-billed and yellow-billed (Coccyzus americanus) cuckoos, known for their low, chuckling call notes. They frequent and breed at the edges of deciduous woodlands, either species tending the young of the other. These birds are valued as destroyers of harmful insects—particularly the tent caterpillar, which few other birds will eat. There are also western and southern species.
Most gregarious of the cuckoos are the anis of the American tropics. The groove-billed ani, from 12 to 14 in. (30–35 cm) long, has black plumage with a faint purple gloss. Anis nest colonially, several females together laying as many as 25 eggs in the same nest, and they may breed at any time of the year.
Of the ground cuckoos, the roadrunner, or chaparral cock, of the southwest deserts is best known. It feeds mostly on small snakes and lizards, which it pounds to death with its heavy bill and swallows headfirst. The roadrunner speeds over the ground at up to 15 mi (24.14 km) per hr with its long tail extended horizontally, its head down, and its ragged crest erect. Roadrunners are weak fliers and nonmigratory. They build coarse nests in thorny bushes; because they lay at intervals, both eggs and young may appear together in the nest.
Also included in the cuckoo family are the coucals, medium to large in size, slow-flying, mostly terrestrial birds of the tropics from Africa to Australia, e.g., the black coucal, Centropus grillii. Cuckoos are classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
..... Click the link for more information. , subphylum Vertebrata, class Aves, order Cuculiformes, family Cuculidae.
any one bird of the suborder Cuculi of the order Cuculiformes. The body measures 15–70 cm long. The bill is bent slightly downward, the tail is usually long and stepped (in some species the tail is forked). The legs are short, and the fourth toe may be directed backward; some ground species have long legs. The dense, short plumage is gray, black, white, or brown in color. The males and females usually have similar coloration. There is one family, the Cuculidae, which comprises six subfamilies (38 genera, 128 species).
Cuckoos are distributed throughout the world except for Antarctica; however, they are found primarily in the tropics. In the USSR there are six species. The common European cuckoo (Cuculus canorus), which measures approximately 35 cm long and weighs about 100 g, is found everywhere except in the tundra. The Himalayan cuckoo (C. saturatus) inhabits forests from Eastern Europe to the Far East. The Indian cuckoo (C micropterus) lives along the basin of the Amur River. The small cuckoo (C poliocephalus) and Hodgson’s hawk cuckoo (Hierococcyx fugax) are found in the forests of the southern Primor’e. The great spotted cuckoo (Clamator glandarius) from Moldavia and Turkmenia is found sporadically. All cuckoos that live in the USSR are migratory, wintering in southern Asia and Africa.
There are approximately 50 species of cuckoos (including all those found in the Soviet Union) that do not build nests and do not brood their eggs. They lay their eggs in the nests of other birds (nest parasitism). Some species take over the nests of other birds but care for their own young; others build their own nests and raise their own young. The females lay from two to seven eggs. The cuckoo the common ani (Crotophaga ani) lays its eggs in a common nest and broods them communally. There are more than 120 known species of host birds, or foster parents, for the common European cuckoo; however, as a rule, cuckoos lay their eggs in only a few other species’ nests. In one particular region the cuckoo may use the nest of the redstart; in another, the nest of the sedge warbler. The color of the cuculine egg is similar to that of the host bird. Upon finding a nest, the cuckoo removes one of the host’s eggs (or less commonly, several eggs) by either eating it or carrying it off and replaces it with one of its own. The cuckoo lays from 12 to 20 eggs each summer. The embryo of the cuculine egg develops more rapidly than those of the host bird (usually in 12.5 days for the common European cuckoo). When the young cuckoo hatches, it throws out the foster parents’ eggs or newly hatched young. In 20 to 22 days the young common European cuckoo leaves the nest.
Although cuckoos destroy other birds and their nests, they are, at the same time, beneficial owing to their destruction of various harmful forest insects (particularly the hairy caterpillars of the silkworm moth). The American common ani feeds in flocks among herds of ungulates, destroying ticks and other parasitic insects. The roadrunner (Geococcyx mexicanus) lives in deserts and eats lizards and snakes. Some cuckoos, such as the crow pheasant (Centropus sinensis), eat fruits and berries.
REFERENCESPtitsy Sovetskogo Soiuza, vol. 1. Edited by G. P. Dement’ev and N. A. Gladkov. Moscow, 1951.
Zhizn’ zhivotnykh, vol. 5. Moscow, 1970.
A. I. IVANOV